Search is not available for this dataset
query stringlengths 1 13.4k | pos stringlengths 1 61k | neg stringlengths 1 63.9k | query_lang stringclasses 147
values | __index_level_0__ int64 0 3.11M |
|---|---|---|---|---|
Compared with the use of phase-insensitive linear quantum amplifiers of the same gain G, the use of phase-sensitive linear amplifiers on phase coherent classical light sources in an amplifier–attenuator chain reduces the total quantum noise power by a factor of 4, the homodyne noise variance by 2, and the photon number... | For the first time, a monolithically integrated photonic phase-sensitive amplification chip is fabricated and demonstrated based on an InP/InGaAsP platform. Different semiconductor optical amplifiers have been fabricated as well for characterization. On the chip, two tunable laser pumps that are coherently injection-lo... | Dispersive transform spectral imagers with both one- and two-dimensional spatial coverage have been demonstrated and characterized for applications in remote sensing, target classification and process monitoring. Programmable spatial light modulators make it possible to adjust spectral, temporal and spatial resolution ... | eng_Latn | 7,700 |
Optical intensity modulators with closely matched frequency responses are required for the realization of an optical adaptive nulling system for microwave/millimeter-wave multi-element antenna systems. Traveling-wave interferometric modulators fabricated in lithium niobate have been demonstrated that track to within 0.... | The performance of three optics-based interference cancellation systems are compared and contrasted with each other, and with traditional electronic techniques for interference cancellation. The comparison is based on a set of common performance metrics that we have developed for this purpose. It is shown that thorough... | Manufacture and in-service assessment of composite materials can be challenging since there is, yet, no standard method for testing them. Nevertheless, regular inspection is necessary to maintain the structural integrity. This paper describes a nondestructive, broadband noise mapping method that uses a millimeter-wave ... | eng_Latn | 7,701 |
The terahertz(THz) technique has attracted much attention from a variety of applications in fundamental and applied research field,such as physics,chemistry,life sciences,medical imaging,safety inspection,radio astronomy,modern communication,weapon guidance and so on.THz radiation source is a crucial part of THz techni... | CO 2 -pumped THz laser was used to measure a new SiO 2 matrix ceramic composite sample's transmittance. Experimental transmission data reported here were obtained respectively at wavelengths of 118.83μm, 122.4μm, 158.51μm, 184.31μm and 214.58μm. | Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights. | eng_Latn | 7,702 |
The generation and accumulation of random jitter (RJ) in channels using multimode fibers (MMF) and vertical cavity surface emitting lasers (VCSEL) is investigated. A novel theoretical model that accommodates mode partition noise (MPN) and modal-chromatic dispersion interaction (MCDI) for the length dependence of RJ in ... | Mode partition noise may become the dominant performance limitation for single-mode fiber systems. We define the mode partition coefficient k for laser diodes which can be used as a universal index, like threshold current and spectral width, to characterize laser diodes. The k value varies between 1 and 0, and for larg... | Conjugacy separability of any group of the class of one-relator groups given by the presentation $ $ ($m,n>1$) is proven. | eng_Latn | 7,703 |
We firstly propose and demonstrate a new economical approach that can correct the wavefront of the petwatt Ti:sapphire laser system with a beam size of 150mm. By using a deformable mirror with 50mm active aperture in the end of the laser, the focal spot size is reduced effectively. The experimental results show that th... | Unimorph DMs are attractive for laser beam shaping due to their advantages of simplicity, compact, low cost and large ::: stroke. This paper reports a novel unimorph deformable mirror used for laser beam shaping. The developed DM consists of ::: both an inner actuator array and an outer ring actuator. The inner actuato... | By using a superluminescent diode as the light source and a depolariser inside the fibre coil, a constant scale factor is achieved without using polarisation control elements. For long-term behaviour an RMS-bias drift of 10 degrees/h is obtained. | eng_Latn | 7,704 |
We report the characteristics of an erbium-doped GaN semiconductor waveguide amplifier grown by metal-organic chemical vapor deposition. We demonstrated that both 980 and 1480 nm optical pumping were efficient to create population inversion between the I413/2 and I415/2 energy levels. The carrier lifetime in the I413/2... | Excitation cross section of erbium-doped GaN waveguides is measured to be approximately 2.2×10−21cm2 at 980 nm pumping wavelength. This cross section value is found relatively insensitive to the crystalline quality of epilayers. However, spontaneous emission carrier lifetimes in these waveguides are directly related to... | Background ::: Serum calcium (Ca) and inorganic phosphate (Pi) concentrations and calcium-phosphate product (CPP) levels are positively associated with worse outcomes in patients with chronic kidney disease, but there are few data for Pi or Ca and none for CPP in patients with chronic heart failure (CHF). | eng_Latn | 7,705 |
In this paper, we investigate the presence of time delay (TD) signature in chaotic intensity outputs of nanolasers subject to different optical feedbacks (OFs). Simulation results reveal the occurrence of obvious TD feature for the cases where conventional, phase conjugate and grating mirror feedbacks are employed. So,... | In this paper, we present a polarization-assisted $L$ -ary differential phase-shift keying multipulse pulse-position modulation (PA. $L$ DPSK-MPPM) technique that is secured in the physical layer by a discrete-chaos system. The all-optical PA. $L$ DPSK-MPPM scheme benefits from the polarization as an additional degree ... | We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero. | eng_Latn | 7,706 |
We investigate a simple and flexible scheme of all fiber Fabry-Perot filter with continuous free spectral range tunability and its application to a multiwavelength SOA laser with eleven lasing channels at room temperature. | We design superimposed in-fiber grating structures to work as multi-channel real-time optical spectrum analyzers for wavelength-division-multiplexing applications. The potential applications of the technique proposed here, as well as extensions to other signal treatments, are also analyzed. | Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights. | eng_Latn | 7,707 |
We propose a novel optical-beam-induced current (OBIC) measurement technique to detect the degradation of the interior of a laser waveguide. OBIC topographies were obtained with incident transverse-magnetic-mode light, such that OBIC became sensitive to interior degradation. We additionally used transverse-magnetic-mod... | We investigated the degradation behavior of distributed feedback lasers by employing the optical-beam-induced current measurement technique. We showed that the degradation mechanism is governed by diffused defects at the waveguide other than those in the vicinity of the antireflection facet. In addition, we found that ... | Blunt trauma abdomen rarely leads to gastrointestinal injury in children and isolated gastric rupture is even rarer presentation. We are reporting a case of isolated gastric rupture after fall from height in a three year old male child. | eng_Latn | 7,708 |
We search for efficient schemes of second and terahertz harmonic generation in nanocomposites consisted of metal-oxide semiconductor quantum dots incorporated into a dielectric matrix, when the quantum dots are in resonance and the dielectric matrix is out of resonance with femtosecond light pulse. It’s established tha... | Recently we observed ultrafast laser-induced phase transition (on a time scale less than 100 fs) to a centrosymmetric semiconductor-like phase at the GaAs surface [1,2] by using time-resolved second harmonic generation in reflection. A phenomenological model describing this phase transition is developed. The new phase ... | The oxidative polymorphism of debrisoquine (DBQ) has been determined in 89 patients with colo-rectal cancer and in 556 normal control subjects. Four patients and 34 controls, with a metabolic ratio >12.6, were classified as poor metabolisers of DBQ (n.s.). | eng_Latn | 7,709 |
We have observed Ar2* emission at 126 nm by use of a high intensity laser pulse as an excitation source. Kinetic analysis revealed that high-intensity laser-produced electrons via optical field induced ionization (OFI) process initiated the Ar2* production kinetics. Ar2* production kinetics initiated by OFI electrons w... | Successful oscillation of a tunable, high-power argon excimer laser is reported. The wavelength was tuned from 124.5 to 127.5 nm with a spectral width of 0.3 nm. The output power of 2.2 MW, obtained at the line center, is 3 orders of magnitude larger than the value reported previously by Wrobel et al. [Appl. Phys. Lett... | Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights. | eng_Latn | 7,710 |
A two-dimensional, electromagnetic, electron fluid computer code predicts picosecond-scale electromagnetic wave generation in a simple air avalanche switch. Similar pulses occur from kilovolts to megavolts for proper scaling of the pressure. At fixed voltage, the pulse width varies with pressure. At fixed pressure, the... | The gas avalanche switch is a laser-activated, high-voltage switch, consisting of a set of pulse-charged electrodes in a high-pressure gas.1–4 Induced electrons from a picosecond-scale laser pulse initiate an avalanche discharge between high-voltage and grounded electrodes. If the voltage, pressure, and dimensions are ... | not available DOI: http://dx.doi.org/10.3329/pulse.v5i2.20263 Pulse Vol.5 July 2011 p.31-40 | eng_Latn | 7,711 |
We experimentally demonstrate the possibility to generate parabolic pulses via a single dispersion decreasing optical fiber with normal dispersion. We numerically and experimentally investigate the influence of the dispersion profile, and we show that a hybrid configuration combining dispersion decrease and gain has se... | Parabolic pulses in optical fibers have stimulated an increasing number of applications. We review here the physics underlying the generation of such pulses as well as the results obtained in a wide-range of experimental configurations. | not available DOI: http://dx.doi.org/10.3329/pulse.v5i2.20263 Pulse Vol.5 July 2011 p.31-40 | eng_Latn | 7,712 |
A novel optical single-sideband (OSSB) signal generation with simultaneous IF signal up conversion technique is proposed to overcome the fiber dispersion problem. With this up-conversion technique, a high frequency OSSB signal is generated by using two low bandwidth intensity modulators in combination with fiber gratin... | An all-optical frequency upconversion technique using a quasi optical single sideband (q-OSSB) signal in a nonlinear semiconductor optical amplifier (NSOA) for radio-over-fiber applications is proposed and experimentally demonstrated. An optical radio frequency signal (f(RF) = 37.5 GHz) in the form of a q-OSSB signal i... | An all-optical frequency upconversion technique using a quasi optical single sideband (q-OSSB) signal in a nonlinear semiconductor optical amplifier (NSOA) for radio-over-fiber applications is proposed and experimentally demonstrated. An optical radio frequency signal (f(RF) = 37.5 GHz) in the form of a q-OSSB signal i... | eng_Latn | 7,713 |
We developed 8 times 8 beam-deflecting optical switch with a switching speed within one microsecond utilizing electro-optic effect of PLZT. A newly-developed radial optical path design and putting-in packaging structure with a monolithic PLC platform were applied. | We investigate the feasibility of implementing an elementary building block for quantum information processing. The combination of a deterministic single photon source based on vacuum stimulated adiabatic rapid passage, and a quantum memory based on electromagnetically induced transparency in atomic vapour is outlined.... | Background ::: The optimal treatment for elderly patients with early-stage non-small cell lung cancer (NSCLC) remains inconclusive. Previous studies have shown that stereotactic body radiotherapy (SBRT) provides encouraging local control though higher incidence of toxicity in elderly than younger populations. The objec... | eng_Latn | 7,714 |
This paper describes the effects of barrier-state carriers on the modal gain of InGaAs-GaAs quantum-well (QW) lasers emitting at 980 nm. Experimental studies and numerical simulations are used to examine several drive configurations, each having a unique effect on the laser response. These include compound drive curren... | We perform a theoretical study of carrier transport effects in the frequency modulation response of single-mode quantum well (QW) lasers under both small and large signal modulations. The lasers considered are ultra-high speed InGaAs/GaAs MQW lasers with intrinsic modulation bandwidth of 40 GHz. A rate-equation model, ... | We report nearly complete preservation of “spin memory” between optical absorption and photoluminescence under excitation >0.2 eV above the band gap in nanometer GaSe slabs. | eng_Latn | 7,715 |
A piezo-tuned CW, single-mode, narrow-linewidth distributed feedback, photonic crystal fibre (DFB-PCF) laser was fabricated. To determine its stability, the laser was used to measure the linewidth of the P11 molecular absorption band of acetylene (C2H2) with a resolution of 0.45pm and a tuning range of 0.22nm. | We demonstrate a stable, CW, single-mode distributed feedback (DFB) photonic crystal fibre (PCF) ring laser with a narrow linewidth of <10 kHz. The incorporation of a polarisation-discriminating feedback loop helps eliminate the detrimental effect of self-pulsing and allows lasing to occur in one single longitudinal mo... | We demonstrate a stable, CW, single-mode distributed feedback (DFB) photonic crystal fibre (PCF) ring laser with a narrow linewidth of <10 kHz. The incorporation of a polarisation-discriminating feedback loop helps eliminate the detrimental effect of self-pulsing and allows lasing to occur in one single longitudinal mo... | eng_Latn | 7,716 |
Coherent beam combination of two thulium-doped fiber laser beams using a multi-dithering technique is presented for the first time. In the experiment, two fiber lasers centered at 1948.6 nm are coherently combined, and a phase modulator based on piezoelectric ceramics transducer is connected in one beam path to compens... | We present a high-power single frequency (SF) Tm-doped fiber amplifier employing all-fiber master oscillator power amplifier (MOPA) configuration. An SF fiber laser with ultrashort cavity and output power of $\sim 40$ mW was used as the seed laser of the MOPA, and the central wavelength located at $\sim 1971$ nm. The f... | Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights. | eng_Latn | 7,717 |
A novel method to determine the linewidth of a semiconductor laser is described. By measuring the noise voltage at the electrical terminal, the electron density variations in the gain medium can be determined. Since these variations are the major cause of the linewidth of semiconductor lasers, both the linewidth and th... | The influence of parasitic elements on the wideband electrical noise in semiconductor lasers is investigated theoretically and experimentally. The results show that the maximum small-signal modulation bandwidth can be determined from measurements of the electrical noise spectrum. A small difference of the peak frequenc... | Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights. | eng_Latn | 7,718 |
We demonstrate polarized blue single photon emission up to 200 K from an In0.2Ga0.8N quantum dot in a single Al0.1Ga0.9N nanowire. The InGaN/AlGaN dot-in-nanowire heterostructure was grown on (111) silicon by plasma assisted molecular beam epitaxy. Nanowires dispersed on a silicon substrate show sharp exciton and biexc... | We report and discuss the origins of linearly polarized single photon emission from site-controlled GaN nanowire quantum dots. The observed single photon emission reveals almost complete linear polarization, in agreement with studies in the literature, which could be of use for applications such as quantum key distribu... | We report and discuss the origins of linearly polarized single photon emission from site-controlled GaN nanowire quantum dots. The observed single photon emission reveals almost complete linear polarization, in agreement with studies in the literature, which could be of use for applications such as quantum key distribu... | eng_Latn | 7,719 |
The motivation of this work is the development of a laser sensor and gyroscope based on short pulse solid state ring laser. In comparison with regular ring laser containing the gain medium and saturable absorber where counterpropagating pulses overlap, a ring synchronously pumped optical parametric oscillator (OPO) whe... | Frequency coupling between the counter-propagating pulses inside a femtosecond ring laser gyroscope is studied. It is shown that frequency lock-in results from the counter-propagating pulses overlapping at or near a scattering surface. Nonetheless, the absence of lock-in with a scatterer at the pulse crossing point is ... | Background ::: Serum calcium (Ca) and inorganic phosphate (Pi) concentrations and calcium-phosphate product (CPP) levels are positively associated with worse outcomes in patients with chronic kidney disease, but there are few data for Pi or Ca and none for CPP in patients with chronic heart failure (CHF). | eng_Latn | 7,720 |
The paper deals with some investigations aimed at applying compensation techniques to reduce nonlinear signal distortion in the Mach-Zehnder modulator of HFC CATV systems. The frequency distribution of secondand third-order intermodulation products of N-channel transmission systems is shown. Models of dual-parallel and... | We have characterized the intermodulation distortion and compression properties of an integrated optical modulator at microwave frequencies by measuring the third-order intercept and 1-dB compression points. Values of +30.0 and +21.4 dBm, respectively, were measured and agree well with theory. When operated in the shot... | We prove that groups acting geometrically on delta-quasiconvex spaces contain no essential Baumslag-Solitar quotients as subgroups. This implies that they are translation discrete, meaning that the translation numbers of their nontorsion elements are bounded away from zero. | eng_Latn | 7,721 |
We have measured the relative timing jitter of two passively mode-locked 10-GHz Er:Yb:glass lasers to be 190 fs (100 Hz-1.56 MHz) in free-running and 26 fs (6 Hz-1.56 MHz) in synchronized operation. | We demonstrate a fundamentally mode-locked fiber laser with a repetition frequency in excess of 2 GHz at a central wavelength of 1.535 mum. Co-doped ytterbium-erbium fiber provides the gain medium for the laser, affording high gain per unit length, while a semiconductor saturable absorber mirror (SAM) provides the puls... | We demonstrate a fundamentally mode-locked fiber laser with a repetition frequency in excess of 2 GHz at a central wavelength of 1.535 mum. Co-doped ytterbium-erbium fiber provides the gain medium for the laser, affording high gain per unit length, while a semiconductor saturable absorber mirror (SAM) provides the puls... | eng_Latn | 7,722 |
A high quality Multiple Diode Laser (MDL) has been built that combines 16 Spectra Diode Lab's laser diodes into a single beam using both wavelength and polarization combining. The MDL was designed and built to space flight requirements. Critical submicrometer tolerances to achieve wavelength stability, beam collimation... | Wideband Lasercour Transmitter PerformanceRobert J. SmithDepartment of Electro- Optics, McDonnell Douglas Astronautics Co.Bldg. IOTA, Area 231, P.O. Box 516, St. Louis, Missouri 63166A Wideband Lasercom Transmitter based on dichroic combination of directly modulatedGaAlAs laser beams was built, and its performance with... | By using a superluminescent diode as the light source and a depolariser inside the fibre coil, a constant scale factor is achieved without using polarisation control elements. For long-term behaviour an RMS-bias drift of 10 degrees/h is obtained. | eng_Latn | 7,723 |
High frequency stabilization of a 2.2-W injection-locked laser-diode-pumped Nd:YAG laser to a high-finesse optical cavity has been realized by frequency control of the master laser. With the help of an external electro-optical modulator, the feedback bandwidth was extended to 1 MHz and the frequency noise relative to t... | The highly sensitive, phase- and frequency-resolved detection of microwave electric fields is of central importance for diverse fields ranging from astronomy, remote sensing, communication and microwave quantum technology. However, present quantum sensing of microwave electric fields primarily relies on atom-based elec... | We demonstrate a stable, CW, single-mode distributed feedback (DFB) photonic crystal fibre (PCF) ring laser with a narrow linewidth of <10 kHz. The incorporation of a polarisation-discriminating feedback loop helps eliminate the detrimental effect of self-pulsing and allows lasing to occur in one single longitudinal mo... | eng_Latn | 7,724 |
An all-optical triode based on a tandem wavelength converter was realized using cross-gain modulation in two reflective InGaAsP/InP semiconductor optical amplifiers. The reflective semiconductor optical amplifiers were utilized to improve output extinction ratio as well as logic operation output performance. The output... | Semiconductor optical amplifier (SOA) module, RSOA, SOA with mirror has become an essential component to be at ::: the head of negative feedback amplification effect, optimum gain, and cross-gain modulation with demand for longer ::: transmission lengths. The SOA module is expected to have an advantage of exhibiting mu... | By using a superluminescent diode as the light source and a depolariser inside the fibre coil, a constant scale factor is achieved without using polarisation control elements. For long-term behaviour an RMS-bias drift of 10 degrees/h is obtained. | eng_Latn | 7,725 |
Combinatorial pulse position modulation for power-efficient free-space laser communications | A new modulation technique called combinatorial pulse position modulation (CPPM) is presented as a power-efficient alternating to quaternary pulse position modulation (QPPM) for direct-detection, free-space laser communications. The special case of 16C4PPM is compared to QPPM in terms of data throughput and bit error r... | The present invention, a) a pyrimidylaminobenzamide compound, and b) pharmaceutical combination comprising a mTOR kinase inhibitor, and to provide a method of treating or preventing proliferative diseases using such combinations. | eng_Latn | 7,726 |
High stable power control of a laser diode | In this paper, the low and the high frequency noises of a laser diode have been analyzed. Based on the analysis a novel scheme that adapts analog and digital hybrid techniques is proposed to stabilize the output power of a laser diode. With the hybrid controller, the low and the high frequency noises of a laser diode a... | -We describe a simple method to generate wavelength-tunable pulses by using a semiconductor optical amplifier (SOA) as an intensity modulator and a gain medium. Wavelength tunable pulses at a repetition rate of 4.8 GHz have been generated. | eng_Latn | 7,727 |
Temporal structure of a short powerful laser pulse under an operation of ionization processes | It is shown, that the essential laser pulse energy depletion due to ionization losses occurs at rather large distances only. The process of depletion is accompanied by a significant steepening of the temporal pulse form corresponding to the formation of a sharp ionization front of a medium density. The latter, in turn,... | This paper presents design and characteristics of a compact, highly integrated Ka-band T/R module built by using a miniature magnetron in the transmitter chain. By implementing a solid-state modulator and microstrip design in the microwave part of the receiver, the overall size of the module has been reduced significan... | eng_Latn | 7,728 |
Tunable external cavity diode laser | (57) Abstract: In the external cavity laser device, a semiconductor diode laser, temperature control means for controlling the temperature of the laser, a current control means for controlling the injection current of the laser, and an external cavity a, the external cavity has a placement wavelength selection means to... | A simple, isothermal and autocatalytic system for the amplified detection of DNA was ingeniously designed based on target-triggered Y-shaped junction probe assembly, followed with a nicking endonuclease-mediated cascade recycling process. A superior detection limit of 0.1 pM towards the target DNA with an excellent sel... | kor_Hang | 7,729 |
Optical Design of Holographic Plane Grating Double Monochromator with the Double Decked Ebert-Fastie Structure | For the need of high-precision spectral radiance measurement, a holographic plane grating double monochromator with the double decked Ebert-Fastie structure is designed. This system consists of two spherical collimating mirrors, a plane mirror, a roof mirror, two holographic plane gratings, entrance slit, exit slit and... | Abstract According to the method described in reference [1], we have designed a series of corrector systems for Cassegrain telescopes automatically with an electronic computer. The calculations were carried out under the following two conditions: the primary and secondary mirrors have strictly conical surfaces, and the... | eng_Latn | 7,730 |
Time Simulations on Anti-Jamming Capability of Mono-Pulse Radar Seeker | To research the performance of mono-pulse active radar seeker under self-screening jamming(SSJ) and non-SSJ,the time domain models of mono-pulse angle tracking system which traced pressed noise jamming source under SSJ and nonSSJ were put forward in this paper.The simulation results showed that the performance of the a... | We present a study of resonant Raman scattering of trans-(CH${)}_{\mathrm{x}}$ chains embedded in polyvinylalcohol in the two different systems of polyvinylene and polarizer K. These systems show marked differences as well as common properties and are analyzed and compared with polyacetylene within the frame of the amp... | eng_Latn | 7,731 |
Limited Discrepancy Beam Search | Beam search reduces the memory consumption of best-first search at the cost of finding longer paths but its memory consumption can still exceed the given memory capacity quickly. We therefore develop BULB (Beam search Using Limited discrepancy Backtracking), a complete memory-bounded search method that is able to solve... | We present preliminary findings regarding an optical cross-bar switch concept based on integrated silicon photonics waveguides and a MEMS device. Finite difference time domain simulations were performed were performed at a wavelength of 1550 nm to validate the initial design. Simulations indicate that there is a 9 dB d... | eng_Latn | 7,732 |
Optical lattices for electrons in semiconductors | We theoretically investigate the trapping of electrons in a semiconductor using counter-propagating laser beams. The presence of trion resonances leads to efficient electron trapping. Comparison to atoms and feasibility of the scheme are discussed. | PROBLEM TO BE SOLVED: To notify a user at the timing when mechanical engagement of an ink tank is assured so that the user does not stop operation of installation of the ink tank before the installation is completed.SOLUTION: In a substrate 100 are provided a light emitting portion 101 and a control unit 103 that contr... | eng_Latn | 7,733 |
Femtosecond laser radiation frequency converters for lidar monitoring of the atmosphere | The possibility of using biaxial nonlinear crystals in the optical converters of femtosecond radiation pulses for laser sounding of the atmosphere has been studied. A method of broadband monitoring of the atmosphere composition using the differential optical absorption spectroscopy technique is described. The results o... | The paper presents results of finite-element modeling and the analysis of temperature fields on the RT-70 radio telescope main reflector arising from the influence of solar heat. The worldwide experience of the design and creation of unique constructions is analyzed and the mechanical problems of the full-circle radio ... | eng_Latn | 7,734 |
Two-Color Radiation Generated in a Seeded Free-Electron Laser with Two Electron Beams | We present the experimental evidence of the generation of coherent and statistically stable two-color ::: free-electron laser radiation obtained by seeding an electron beam double peaked in energy with a laser ::: pulse single spiked in frequency. The radiation presents two neat spectral lines, with time delay, frequen... | Abstract In this paper we present a new correction method of inner filter effects that occurs when measuring fluorescence Excitation–Emission Matrices (EEM) of concentrated solutions. While traditional method requires absorption measurement or sample dilution(s), the Mirrored Cell Approach (MCA) only requires two diffe... | eng_Latn | 7,735 |
Improved tomographic imaging of wavelength scanning digital holographic microscopy by use of digital spectral shaping. | The technique of wavelength scanning digital holographic microscopy (WSDHM) is improved by use of a digital spectral shaping method which is used to suppress the sidelobes of the amplitude modulation function in WSDHM for non-Gaussian-shaped source spectra. Spurious structures caused by sidelobes can be eliminated in t... | The effects of gain guiding and thermal guiding on the cavity mode formation for quasi-three-level microchip lasers are investigated. A parameter describing the dominant guiding mechanisms at the lasing threshold is defined. Paraxial wave propagation equation for the field envelope in the gain medium with thermal-induc... | eng_Latn | 7,736 |
Effect of the thermal heating of a crystal on the diffraction of pulses of a free-electron X-ray laser | Spatiotemporal dependences of the distribution of the crystal temperature under the effect of pulses of a free-electron X-ray laser are found using the solution of a thermal conductivity equation. The effect of temperature, its gradient, and the deformation of the crystal lattice on the diffraction reflection and the t... | Abstract Optical transmission loss changes upon curing the mixture of epoxy/ethylene diamine were studied A UV-Vis spectrum measured during the cure process was utilized to monitor both cure process and transmission loss change simultaneously. It was found that initial homogeneity of the epoxy/EDA mixture was the key p... | eng_Latn | 7,737 |
Apparatus for compensating frequency offset and method thereof in orthogonal frequency division multiplexing system | There is provided an apparatus and method for compensating for a frequency offset in an orthogonal frequency division multiple)ing (OFDM system. In the frequency offset compensating apparatus, a correlating portion demodulates input data by fast Fourier transformation, delays a demodulated symbol by a predetermined per... | We report on experimental studies on the beam quality of the 8μm ZGP optical parametric oscillator(OPO). Through conducting a series of comparative experiments, the effects of resonator length, type of phase matching, resonant wavelength and structure of the resonator on the beam quality of ZGP OPO were studied respect... | eng_Latn | 7,738 |
Design and performance evaluation of a compact, large-area PET detector module based on silicon photomultipliers | A PET module that comprises a pair of compact, high-resolution and large-area detectors based on silicon photomultipliers (SiPM) was developed and evaluated. The detector's effective area was 24 mm x 24 mm. LYSO crystals measuring 1.9 mm x 1.9 mm x 10 mm and charge division circuit were employed to obtain high spatial ... | We report the arbitrary modulation of chirped ultrashort laser pulses with a 70 GHz bandwidth. In the proof-of-principle experiment, modulation of Ti:sapphire laser emission was performed by the acousto-optic dispersive delay line, and the temporal pulse shape was measured with a picosecond streak camera. | eng_Latn | 7,739 |
Transmission spectrum of the Lyot filter | The improved method for calculating the Lyot filter parameters has been developed. The two-plate and three-plate Lyot ::: filters transmission spectra for the low threshold lasers tuned in the 1100-1300 nm spectral region are computed. | A new scheme for nonlinear image transfer with large-wavelength conversion and its possible applications for fine-line lithography are presented. The process uses a higher-order nonlinearity, and the coupled wave equations are solved in the lowest approximation that retains this nonlinearity. | eng_Latn | 7,740 |
Influence of External Fields and Environment on the Dynamics of Phase Qubit-Resonator System | We analyze the dynamics of a qubit-resonator system coupled with a thermal bath and external electromagnetic fields. Using the evolution equations for the set of Heisenberg operators that describe the whole system, we derive an expression for the resonator field, accounting for the resonator-drive, -bath, and -qubit in... | We evaluate the electric quadrupole moments of the ${^1}\!S_0$ and ${^3}\!P_0$ clock states of $^{27}$Al$^+$ and $^{115}$In$^+$. To capture all dominant contributions, our analysis extends through third order of perturbation theory and includes hyperfine coupling of the electrons to both the magnetic dipole and electri... | eng_Latn | 7,741 |
Experimental demonstration of a simple method to engineer a single qutrit state with biphotons | Abstract A simple method to engineer qutrit state with biphotons is realized. The method is based on Hong–Ou–Mandel interferometer and it is insensitive to disturbance comparing to Mach–Zehnder interferometer in principle. Moreover, a tomography procedure is employed to reconstruct the output states. | The application of phase-shifting photoelasticity to real- time dynamic event involves simultaneous recording of the four phase-shifted images. This purpose is realized in this paper by using a special beam-splitting lens called Multispec Imager. The isoclinic and isochromatic parameters for a given time in a dynamic e... | eng_Latn | 7,742 |
Low attenuation mode converter with modal power distribution controllability by twist processing in step-index optical fibers | We proposed a short-fiber-length mode scrambler that reproduces the equilibrium mode distribution of an A3e fiber. The mode scrambler is compact, mode-controllable and has low attenuation. It is effective for not only hard plastic-clad fiber but also all step-index fibers, such as all-glass and plastic optical fibers. | We have designed and demonstrated a chirped ladder-type tunable filter and discussed its potential application for a tunable diode laser. A ladder interferometric filter normally has a periodic passband, which makes it impossible to stabilize laser oscillation frequency. To overcome this drawback, we have designed, fab... | eng_Latn | 7,743 |
Electronic control of frequency converter sets for testing aircraft models | THE TESTING of airplane scale models in wind tunnels has brought about a demand for variable frequency a-c power for controlling the speed of power model motors used to drive the propellers of the plane models. To obtain aerodynamic data on the plane model which are equivalent to the expected performance of the actual ... | Abstract : The first part of this report discusses a X-modulator, a powerful device in terms of optical computation, routing, and interconnection. The device is a 3 input, 3 output conservative and reversible switch, an optoelectronic Fredkin gate. Using arrays of these modulators, various reconfigurable switching, rou... | eng_Latn | 7,744 |
Insertion-loss-free 1/spl times/4 optical switch fabricated using bandgap-energy-controlled selective MOVPE | A 1/spl times/4 optical switch consisting of a passive 1/spl times/4 splitter and four laser diode amplifier gates was designed and fabricated using high-pressure bandgap-energy-controlled selective MOVPE. Insertion-loss-free operation with low injection current was achieved. | The paper presents recent developments in exact strip postbuckling analysis for anisotropic plates with combined in-plane loading and various in-plane edge conditions. The analysis improves the accuracy of the postbuckling mode ::: and the consequent prediction of stresses and strains in the postbuckling range. Plates ... | eng_Latn | 7,745 |
Housing for an optoelectronic semiconductor component and semiconductor component | The invention relates to a housing (1) for an optoelectronic semiconductor component (10). The housing (1) comprises a housing body (2), a first connecting lead (31) and a second connecting lead (32), wherein the first connecting lead (31) and the second connecting lead (32) each extend in a vertical direction through ... | This thesis describes high-speed photodiodes in standard CMOS technology ::: which allow monolithic integration of optical receivers for short-haul communication. The electronics for (multiple users) long-haul communication is very expensive (InP, GaAs), but the usage is justified by the large number of users. For shor... | eng_Latn | 7,746 |
Generation and Direct Detection of Broadband Mesoscopic Polarization-Squeezed Vacuum | Using a traveling-wave optical parametric amplifier with two orthogonally oriented type-I BBO crystals pumped by picosecond pulses, we generate vertically and horizontally polarized squeezed vacuum states within a broad frequency-angular range. Depending on the phase between these states, fluctuations in one or another... | The authors consider the synthesis of arbitrary fibre-optic delay line filters using a modified Pade method. Although these are inherently positive systems, we show that filters with negative coefficients can be implemented by a suitable decomposition of their impulse response together with a differential photodetectio... | eng_Latn | 7,747 |
A laser Doppler velocimeter employing the laser as a mixer-oscillator | A laser Doppler velocimeter is described in which the laser is employed not only as a light source, but also as a mixer-oscillator, in order to give a simpler optical system. The efficiency is comparable to that of a con-ventional system, such as a Michelson interferometer, and coherence requirements do not impose very... | Abstract A new type of bifluorophoric molecule consisting of two heterocycle-linked coumarin fluorophors is studied. A high laser efficiency, a broad tunability range and good photostability for two synthesized biscoumarins are observed. One of the proposed biscoumarins covers the green spectral region where the effici... | eng_Latn | 7,748 |
A tunnel injection quantum dot comb laser with wideband emission spectra and temperature stability | A quantum dot comb laser with a 102 nm broad spectrum of emission and high temperature stability is demonstrated. | -We describe a simple method to generate wavelength-tunable pulses by using a semiconductor optical amplifier (SOA) as an intensity modulator and a gain medium. Wavelength tunable pulses at a repetition rate of 4.8 GHz have been generated. | eng_Latn | 7,749 |
The Genetics of Hyperkeratosis Lenticularis Perstans | Hyperkeratosis lenticularis perstans (HLP) occurred in three generations of the same family. The evidence presented favors the concept that HLP is a genodermatosis with a late onset and is transmitted by an autosomal dominant gene. | Two types of powerful, continuous action gas lasers are being most actively developed at the present time: the electrical discharged and the gas dynamic lasers. IVTAN research workers proposed a new method of generating laser beams - a magnetohydrodynamic method. As working fluid an MHDL may utilize a mixture of He + C... | eng_Latn | 7,750 |
Equilibrium control in the HBTX1C reversed field pinch | Abstract The horizontal position of the plasma in the HBTX1C reversed field pinch has been controlled to ± 1 mm by a feedback circuit. The plasma is moved to the desired position by momentarily closing either one of two semiconductor switches which alter the way in which current is shared by the parallel-connected fiel... | Abstract A simple method to engineer qutrit state with biphotons is realized. The method is based on Hong–Ou–Mandel interferometer and it is insensitive to disturbance comparing to Mach–Zehnder interferometer in principle. Moreover, a tomography procedure is employed to reconstruct the output states. | eng_Latn | 7,751 |
Aerodynamic characteristics of over/under inlet for turbine based combined cycle engine | To discuss the operating characteristics of the inlet which is used in Turbojet/Ramjet Combined Cycle engine at Mach 0 to 5,the profile of an "over/under" TBCC variable geometry inlet was given.Using CFD tools,the two-dimensional flow-field of the inlet was shown with properties of flow at different operating points.At... | We proposed a simple method to realize optical Fourier transform during the nonlinear wave shaping processes. In this method, an integrated optical superlattice is designed to realize multiple optical functions, which plays important roles in both the nonlinear harmonic generation process and the optical Fourier Transf... | eng_Latn | 7,752 |
Preparation and second-harmonic generation in Pb-doped oxide glasses | PbO-B 2 O 3 glasses were prepared by traditional melting method. XRD and optical spectra measurements were done ::: to check properties. Second-harmonic generation was observed in the glasses induced by thermal treatment and ::: thermally poling process, respectively. But second-harmonic generation intensity was normal... | Abstract A simple method to engineer qutrit state with biphotons is realized. The method is based on Hong–Ou–Mandel interferometer and it is insensitive to disturbance comparing to Mach–Zehnder interferometer in principle. Moreover, a tomography procedure is employed to reconstruct the output states. | eng_Latn | 7,753 |
Optical-disk media fabrication for high data-transfer rate. | Two media fabrication methods are developed in order to improve the data-transfer rate of optical disks. One is a beam-scanning method for multispiral pregroove recording. A sixfold spiral pregroove with a 1.6-μm spacing can be recorded with this method. The other is a method for fabrication of phase-change optical-dis... | The TRANSMEDIA LITERACY project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no 645238 | eng_Latn | 7,754 |
Sol–Gel Synthesis of Silica Glasses, Doped with Nanoparticles of Cerium Oxide | A method is suggested for creating nanoparticles CeO2 incorporated into silica matrix using chemical modification of fumed silica surface with cerium acetylacetonate. A variant of the sol–gel method for synthesizing of silica glasses and optical composites containing nanoparticles of cerium oxide has been designed. Mon... | Abstract In high performance polysilicon thin film transistors (TFTs) the uniformity of electrical characteristics remain a major problem. This situation has stimulated a growing activity aiming to control the lateral growth phenomenon. However, most of the techniques require additional processing steps or a rather hig... | eng_Latn | 7,755 |
The role of plasma in the transfer of Escherichia coli cytokine-inducing substances across high-flux cellulosic membranes | It has been previously reported that the presence of plasma in the blood side compartment of cellulosic membranes enhances the transfer of cytokine-inducing substance (CIS) present in the dialysate compartment. This apparent enhancement could either be a result of (1) improved membrane permeability to CIS, (2) transfer... | A new approach to the creation of a quantum cascade laser is suggested, which employs interband transitions in quantum wells with a coherent electron transport. The coherent electron transport is studied based on the simplest two-band Kane model, in which the interaction between states of the conduction and valence ban... | eng_Latn | 7,756 |
Simultaneous measurement of one- and two-photon excited fluorescence from a single sample: a detection method for oligonucleotides | A new method has been developed that is based on the use of a single-excitation wavelength from a cw laser to excite simultaneously one-photon and two-photon fluorescence (TPF). Fluorescence bands of a sample containing two oligonucleotides, one labeled with a one-photon fluorescence dye and the other with a TPF dye, c... | Abstract : We have used an optical parametric oscillator (OPO) to characterize the fiber-optic cache-memory buffers. Prior to addition of the new OPO system, a home-built saturable-absorber mode locked erbium/ytterbium-fiber laser had been used in all our experiments. With the addition of a new OPO, we are able to reme... | eng_Latn | 7,757 |
Electro-optic tuning of vacuum Rabi coupling in semiconductor quantum microcavity structures | Abstract Electro-optic tuning of vacuum Rabi coupling is demonstrated on a very high quality semiconductor quantum microcavity structure with reflectivity linewidths at resonance of 0.9 and 1.1 meV. The variation in energy of the reflectivity peaks as a function of electric field is fitted very well by a transfer matri... | Abstract A pre-existing plastic rabbit ear chamber was modified to be applicable for intravital-microscopic observations in pharmacological as well as pathophysiological studies on inflammation. The chamber consists of a base disk, a mica (or glass) cover-slip and a holder ring. The base disk has a round-table with a c... | eng_Latn | 7,758 |
ECT versus tricyclic antidepressants in depression: a review of the evidence. | The claim is often made that ECT is more effective and works more rapidly than antidepressant drugs in the treatment of depression. The author reviews the nine controlled studies comparing the two treatments that appear in the literature. All of the studies were methodologically deficient, especially concerning definit... | High-performance electromagnetic susceptibility (EMS) for a 2.5Gb/s optical transceiver module is first demonstrated by polymer-based multi-wall carbon nanotubes (MWCNT). The EMS performance is experimental evaluated by the eye diagram and bit-error-rate test for a 2.5Gb/s lightwave transmission system. The plastic tra... | eng_Latn | 7,759 |
Stereoscopic construction and practice of optoelectronic technology textbook | It is a professional degree course textbook for the Nation-class Specialty—Optoelectronic Information Science and Engineering, and it is also an engineering practice textbook for the cultivation of photoelectric excellent engineers. The book seeks to comprehensively introduce the theoretical and applied basis of optoel... | This chapter contains sections titled: Introduction SONET Frames Virtual Tributaries STS-N Frames Maintenance Summary This chapter contains sections titled: References | eng_Latn | 7,760 |
Memory system for digital video and self-related to method for storing digital video data | A digital video (DV) memory system (700) comprises an interface module (702) which receives an incoming signal and the incoming signal into an incoming bit stream; a DV demultiplexer (704) directly to the interface module (702) is connected to receive the incoming bit stream, wherein the DV-demultiplexer (704) received... | This paper presents a gimbaled MEMS scanning mirror (MSM) especially developed for adaptive raster scanning in a ::: novel 3D ToF laser camera. Large quasi-static deflections of ±10° are provided by vertical comb drives in vertical ::: direction in contrast to resonant horizontal scanning of the 2.6x3.6mm elliptical mi... | eng_Latn | 7,761 |
Reconfigurable I/O interface for mobile equipments | Standardized I/O interfaces such as USB, E1A/T1A-232, PS/2, Ethernet, IEEE 1394, etc., gives us "High Connectivity" that means connections between different devices are guaranteed and users do not have to take care of the connections. However the standardized I/O interfaces are not optimized to all devices and various ... | We investigate the spatial quantum properties of the light emitted by a perfectly spatially degenerate optical parametric oscillator (self-imaging OPO). We show that this device produces local squeezing for areas bigger than a coherence are that depends on the crystal length and pump width. Furthermore, it generates lo... | eng_Latn | 7,762 |
Novel approach to fast determination of cholesterol oxidation products in Cypriot foodstuffs using ultra‐performance liquid chromatography‐tandem mass spectrometry | This paper reports the development and validation of a new method based on ultra-performance LC coupled to MS/MS for the simultaneous determination of four cholesterol oxidation products (COPs) in foodstuffs in only 4.1 min. The COPs were detected by ESI in positive-ion mode with multiple reaction monitoring, and the m... | Abstract : We have used an optical parametric oscillator (OPO) to characterize the fiber-optic cache-memory buffers. Prior to addition of the new OPO system, a home-built saturable-absorber mode locked erbium/ytterbium-fiber laser had been used in all our experiments. With the addition of a new OPO, we are able to reme... | eng_Latn | 7,763 |
An optical MEMS cross-bar switch | We present preliminary findings regarding an optical cross-bar switch concept based on integrated silicon photonics waveguides and a MEMS device. Finite difference time domain simulations were performed were performed at a wavelength of 1550 nm to validate the initial design. Simulations indicate that there is a 9 dB d... | Most commercial cyclotrons intended for medical isotope production provide a limited number of beam ports crowded into a minimal vault space. Taking advantage of our new lab construction, we planned and installed a beam-line on port ♯2 of our GEMS PETtrace to bring beam to an additional 5 target positions. These are or... | eng_Latn | 7,764 |
Laser-induced fluorescence in the infrared from high-resolution Fourier transform spectroscopy | A comparison is made between stepwise and continuous scanning high-resolution Fourier transform spectrometers (HRFTSs) for the study of laser-induced fluorescence spectra of simple models in the infrared with a dense spectrum. The high-quality data show that the HRFTS is an excellent instrument for studying molecular s... | We demonstrate an effective technique which allows one to characterize a small radius micro-ring resonator via low coherence interferometric measurement beyond light source bandwidth limitation. The experimental results show significant improvements in the extracted parameters. | eng_Latn | 7,765 |
High-performance photorefractive polymer operating at 1550 nm with near-video-rate response time | The development of a high-performance photorefractive polymer composite operating at 1550 nm is reported. We show 40% internal diffraction efficiency with response time of 35 ms and a net gain of 20cm−1 in four-wave mixing and two-beam coupling experiments, respectively. This is more than an order of magnitude improvem... | Abstract Transmission spectra of a photonic crystal resonator structure have been obtained where the Bragg dielectric mirrors contain a finite number of periods with an inverted order of layers and the resonator layer is made of a ferroelectric with a permittivity many times exceeding the permittivity of the layers in ... | eng_Latn | 7,766 |
Epifluorescence microscopic observation of monolayers of dipalmitolophosphatidylcholine: dependence of domain size on compression rates | Abstract A fluorescence microscopic technique was used to observe phase transitions in monolayers of DPPC. The sizes of the domain structures observed were found to be dependent on the rate of compression of the monolayer. The distribution of domain sizes for different rates of compression were unimodal, but the scatte... | We resolve the long standing controversy regarding the imaging by a planar lens made of left-handed media and demonstrate theoretically that its far field image has a fundamentally different origin depending on the relationship between losses {inside} the lens and the wavelength of the light $\lambda$. At small enough ... | eng_Latn | 7,767 |
Quasi-static microscanner with linearized scanning for an adaptive 3D laser camera | This paper presents a gimbaled MEMS scanning mirror (MSM) especially developed for adaptive raster scanning in a ::: novel 3D ToF laser camera. Large quasi-static deflections of ±10° are provided by vertical comb drives in vertical ::: direction in contrast to resonant horizontal scanning of the 2.6x3.6mm elliptical mi... | Abstract A simple method to engineer qutrit state with biphotons is realized. The method is based on Hong–Ou–Mandel interferometer and it is insensitive to disturbance comparing to Mach–Zehnder interferometer in principle. Moreover, a tomography procedure is employed to reconstruct the output states. | eng_Latn | 7,768 |
ADIABATIC TRANSITION TRANSFER PHENOMENON OFELECTRONS AND THE QUANTUM STATISTICAL PROPERTIES OF LIGHT FIELD IN A KERR MEDIUM | AbstractWe first derive the state vector of a cascade three level atom interacting with pair coherent states in a kerr medium.It is shown by numerical calculations that the Kerr effect results in the adiabatic transition transfer phenomenon of electrons,and the superstructures in the long time behavior of the quantum ... | Using the Stevens–Tiersten equation for slowly varying thickness modes in doubly rotated quartz plate piezoelectric resonators, we determine optimal electrode shape and size for these resonators. The electrodes obtained are optimal in that they satisfy Bechmann’s number in every direction. | yue_Hant | 7,769 |
Fiber lasers integration for LMJ | Abstract The Fibre-Injection System in the LIL–LMJ facilities makes use of a single-mode fiber based arborescent architecture. Starting from a unique single-mode oscillator, it consists of a high performance PM design which is dedicated to the generation of pulses onto a large number of synchronous outputs. The optical... | The frequency characteristics of Josephson own radiation have been studied by means of Fourier spectroscopy. The FIR measurements were performed with the help of Fourier spectrometer coupled with the Nb Josephson junction. The main feature of this technique is that one Josephson junction operates as both generator and ... | eng_Latn | 7,770 |
ICPD: an SOI-based photodetector with high responsivity and tunable response spectrum | A novel photodetector based on a silicon-on-insulator (SOI) substrate is demonstrated experimentally in this work. The device uses the interface coupling effect in an SOI transistor structure to amplify the photocurrent, and thus achieves extremely high responsivity up to 6×104 A/W. The responsivity of the device under... | Codes with traceability properties are used in schemes where the identification of users that illegally redistribute content is required. For any code with traceability properties, the Identifiable Parent Property (c-IPP) seems to be less restrictive than the Traceability (c-TA) property. In this paper, we show that fo... | eng_Latn | 7,771 |
Achieving publication excellence in the Journal of the Acoustical Society of America | Publications in refereed acoustics journals are of significant relevance for scientists and engineers in acoustics-related fields. The Journal of the Acoustical Society of America (JASA) encourages authors to submit papers to JASA for publication. JASA regularly publishes detailed updated guidelines and instructions in... | We review recent methods to increase the speed of the nonlinear optical response of semiconductor optical amplifiers (SOAs), including the use of filters and of an additional SOA in the 'turbo-switch' configuration. We also consider the effects of optimising parameters, such as the confinement factor and optical area, ... | eng_Latn | 7,772 |
Influence of vibrational relaxation on the quantum efficiency of a KrF excimer laser | A theoretical analysis is made of the kinetics of electronic–vibrational relaxation of excimer molecules in the active medium of a KrF laser. Equations are derived to describe the dependence of the lasing quantum efficiency on the photon flux in the resonator, on the mechanism of formation of electronically excited mol... | The generation and behavior of the fractal Koch array factor from a Kaiser window generator is studied. The main advantage of using Kaiser windows is that pattern parameters become much more flexible through altering the Kaiser window. The mainlobe width, current distribution, side-lobe ratio are now adjustable. Differ... | eng_Latn | 7,773 |
WDM fiber laser source using loop mirror configuration | A novel, simple, and flexible WDM laser source is demonstrated using a loop erbium-doped fiber amplifier. Two configurations of the source are investigated where reflecting FBGs are cascaded in series or parallel at the loop outputs. High output power per channel with a signal-to-noise ratio better than 55 dB can be ac... | We analyze different families of discrete maps\ in the N-qubit systems in the context of the permutation invariance. We prove that the tomographic condition imposed on the self-dual (Wigner) map is incompatible with the requirement of the invariance under particle permutations, which makes it impossible to project the ... | eng_Latn | 7,774 |
Photodiode nonlinearity measurement using a linearized phase-modulated optical link | A new technique to determine the nonlinearity of high-speed photodiodes is presented. Utilizing a linearized phase-modulated link architecture, we directly measure the photodiode intermodulation distortion. Our results agree with those obtained via a phase-locked laser technique. | The invention discloses a plasma electrolytic oxidation automate control device and method that includes the following steps: putting the processing material as anode into silicate solution and connects to the two poles of AC power supply with cathode material through wire, the signals collected from current sensor and... | eng_Latn | 7,775 |
Communication Ring Initialization without Central Control | Abstract : This short memorandum describes a novel combination of three well-known techniques; the combination provides a systematic way of initializing a local-area ring network without previous, static designation of a distinguished station. The result is a distributed algorithm that dynamically designates a distingu... | We introduce a class of critical states which are embedded in the continuum (CSC) of one-dimensional optical waveguide array with one non-Hermitian defect. | eng_Latn | 7,776 |
Midinfrared emission from near-infrared quantum-dot lasers | We report the electrically pumped emission of midinfrared (MIR) radiation from bipolar quantum-dot lasers during near-infrared lasing. The MIR spectrum exhibits a peak at 16 μm and is dominantly TM polarized. The MIR intensity exhibits a superlinear dependence on the injection; a maximum MIR power of 0.1 μW per facet w... | Abstract A simple method to engineer qutrit state with biphotons is realized. The method is based on Hong–Ou–Mandel interferometer and it is insensitive to disturbance comparing to Mach–Zehnder interferometer in principle. Moreover, a tomography procedure is employed to reconstruct the output states. | eng_Latn | 7,777 |
PID Parameters Auto-tuning Based on PLC | PID controllers are widely used in process industry.But the control quality of PID loops operating is different in industrial fields and many of them have to be switched to manual mode.Some of them are attributed to process dynamics characteristics which make PID tuning be unsatisfied to control requirements,but some a... | -We describe a simple method to generate wavelength-tunable pulses by using a semiconductor optical amplifier (SOA) as an intensity modulator and a gain medium. Wavelength tunable pulses at a repetition rate of 4.8 GHz have been generated. | eng_Latn | 7,778 |
Measurement of the quantum yield of triplet formation and short triplet lifetimes by the transient grating technique | A transient grating method for measuring the quantum yield of triplet formation (Φisc) and lifetimes of short‐lived triplet states is proposed. The method is based on a measurement of time dependence of a thermal grating signal with a nanosecond pulsed laser and a cw probe laser. The validity of the method is demonstra... | The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency and multiple channel bandwidths (1.25–20 MHz). Unfortunately, the existing WCDMA turbo interleaver does not permit an efficient high throughput implementatio... | eng_Latn | 7,779 |
Semiconductor InGaAs/GaAs injection lasers with waveguides based on a single quantum well | Semiconductor InGaAs/GaAs injection lasers emitting at λ = 1065 nm have been created with waveguides based on a single InGaAs quantum well. It is found that internal optical losses are determined by the width of an undoped region confined between the n and p type emitters. The room-temperature total output optical powe... | We report fabrication of GaN microrods and their intracellular lasing characteristics for individual cell tracking and labeling application. © 2019 The Author(s) | eng_Latn | 7,780 |
Solar controller driving 50W LED | Photovoltaic power generation technology is already quite mature. But the conversion efficiency of the silicon cells which are heavily used now remains stagnant. Besides, large amounts of energy will be consumed during the process of production. It also makes serious pollution. Thus, to maximize utilization of solar ce... | The computer controlled Laserthermia system by the method of using double ::: channel endoscope with the contact frosted probe and a thermocouple was reported ::: previously.25 In this paper, the single channel method with the new single ::: laser delivery system was studied experimentally. Especially hyperthermal effe... | eng_Latn | 7,781 |
Emergence of Classical Radiation Fields through Decoherence in the Scully± Lamb Laser Model | The quantum theory of the laser of Scully and Lamb is used to determine the longest-lived states of the quantized field in an idealized, single-mode laser cavity. It is shown that quasiclassical states (states with well-defined phase and amplitude) are naturally selected. A quantum trajectory analysis provides some ins... | This paper presents design and characteristics of a compact, highly integrated Ka-band T/R module built by using a miniature magnetron in the transmitter chain. By implementing a solid-state modulator and microstrip design in the microwave part of the receiver, the overall size of the module has been reduced significan... | eng_Latn | 7,782 |
Photochemistry of biological molecules--V. A mechanistic study of the photolysis of cycloalanylalanine in the solid state. | — Earlier studies of the photodamage induced by 254 nm irradiation of linear alanine peptides in the solid state have been supplemented by an investigation into the gaseous photoproducts from the cyclic dipeptide, 3,6-dimethyl-2,5-diketopiperazine. The trans and cis isomers have been prepared and the photoproducts comp... | For large-scale, multi-partite photonic quantum information system, stable on-demand single photon sources are particularly important building blocks. A scheme to implement the source is to multiplex many heralded single photon sources of identical photon pair generators. To achieve this, we must increase the integrati... | eng_Latn | 7,783 |
Detection and Localization of Methionine Sulfoxide Residues of Specific Proteins in Brain Tissue | Methionine sulfoxide is a common posttranslational oxidative modification that can alter protein function. Vul- nerability of specific proteins to methionine oxidation varies and depends on their structure. In the current study, detection of methionine sulfoxide in intact proteins is mediated by novel anti-methionine s... | This paper presents a gimbaled MEMS scanning mirror (MSM) especially developed for adaptive raster scanning in a ::: novel 3D ToF laser camera. Large quasi-static deflections of ±10° are provided by vertical comb drives in vertical ::: direction in contrast to resonant horizontal scanning of the 2.6x3.6mm elliptical mi... | eng_Latn | 7,784 |
Electronic energy dissipation in chloro-aluminum phthalocyanine/methanol system following nonlinear interaction with a train of picosecond pulses | Using the Z-scan technique, we study the nonlinear interaction of a dilute methanolic solution of chloro-aluminum phthalyocyanine with a ∼70 ns long train of laser pulses, each of 18 ps duration. The observations are explained by taking into account, in addition to the photoexcitation of a ground state molecule by a si... | An approach for modeling of planar microwave filters by the Method of Lines (MoL) is presented. The algorithm combines 2-D discretization of the cross-section with the numerically stable impedance/admittance transformation. To improve accuracy and efficiency of this approach, edge conditions are examined and the best e... | eng_Latn | 7,785 |
Experimental Demonstration of the Doppler Frequency Conversion in a Slot Line | Frequency conversion from microwaves to millimetre waves using the Doppler effect in a slot line on an optically excited silicon-on-insulator (SOI) substrate has been experimentally demonstrated. Laser pulses with a wavelength of 532 nm and duration of 33 psec have generated electron-hole plasma periodically at the int... | The University of Newcastle, New South Wales, AustraliaA technique for monitoring and detecting change in a time series of physiologicalobservations is described. The method uses an optimal linear estimator—theKalman niter—to predict future observations of the series and a random walktraversed by the residuals from the... | eng_Latn | 7,786 |
Visible Light Communication System Using an Organic Bulk Heterojunction Photodetector | A visible light communication (VLC) system using an organic bulk heterojunction photodetector (OPD) is presented. The system has been successfully proven indoors with an audio signal. The emitter consists of three commercial high-power white LEDs connected in parallel. The receiver is based on an organic photodetector ... | For an emerging market a mass and cost-effective production of non-silicon micro devices requires an in-process and accurate 3D monitoring to assure the quality. Optical coherence tomography (OCT) ... | eng_Latn | 7,787 |
Oscillator circuits for wide-range tuning | The design and operation of circuits to cover wide tuning ranges at ultra-high frequency, when used in conjunction with triode valves of the disc-seal type, are described in detail. The use of coaxial-line resonators to cover various tuning ranges between frequencies of about 300 Mc/s and 3750 Mc/s, and the practical d... | -We describe a simple method to generate wavelength-tunable pulses by using a semiconductor optical amplifier (SOA) as an intensity modulator and a gain medium. Wavelength tunable pulses at a repetition rate of 4.8 GHz have been generated. | eng_Latn | 7,788 |
Modulated beating signal generation via bias modulations of micro-heaters integrated on dual-mode laser | A simple and compact method of generating modulated beating signals from a dual-mode laser via bias modulation of integrated micro-heaters is proposed and successfully demonstrated. The proposed scheme will enrich the continuous-wave terahertz system applications. | Controlling spatiotemporal chaos in excitable media by applying low-amplitude perturbations {\em locally} is of immediate applicability, e.g., in treating ventricular fibrillation, a fatal disturbance in the normal rhythmic functioning of the heart. We look at a mechanism of control by the local application of a series... | eng_Latn | 7,789 |
Channelrhodopsin Photochromic Reactions Provide Multicolor Optogenetic Control | In this issue of the Biophysical Journal, Venkatachalam and Cohen (1) present an innovative combination of opsin-based optogenetic voltage control with simultaneous imaging of green fluorescent protein (GFP)-based sensors. The challenge is that the overlapping absorption spectra of GFP derivatives and the commonly used... | Abstract : We have used an optical parametric oscillator (OPO) to characterize the fiber-optic cache-memory buffers. Prior to addition of the new OPO system, a home-built saturable-absorber mode locked erbium/ytterbium-fiber laser had been used in all our experiments. With the addition of a new OPO, we are able to reme... | kor_Hang | 7,790 |
Design and analysis of high speed uni-traveling-carrier photodiodes | In this paper, simulations are conducted to investigate high speed uni-traveling-carrier photodiodes (UTC-PDs). The Gaussian doping profile, which can introduce potential gradient and electric field, is presented to be used in the absorption layer. Compared to constant doping and step-graded doping, bandwidth of UTC-PD... | Abstract We have considered, a photon transport problem for two configuration types often encountered in nuclear geophysics. The usual Monte Carlo algorithm was modified so that the photon trajectories were constructed with the aid of uniformly distributed LP τ sequences and their length were restricted. An improvement... | eng_Latn | 7,791 |
Frequency Modulation Of Short Laser Pulses As A Method Of Image Transfer | It is shown, that the Fourier-processing based modulation of short laser pulses can be successfully used for all-optical image transfer. The proposed system contains a transmitter, where the transferred image modulates the frequency profile of the carrier pulse, and a receiver, where after the reverse processing is res... | Optic characteristics of breast tissues have been examined in mothers. An internation was designed to prevent and treat nipple fissures using individualized laser therapy regimens. Individualized laser therapy of 329 mothers at risk of mastitis and 68 mothers with a normal postpartum course reduced five-fold the incide... | kor_Hang | 7,792 |
Screening charge distribution in pockels readout optical modulators | A voltage is applied through semitransparent electrodes on either side of the structure and then the photoconductor is explosed to light. The photocarriers drift to the photoconductor-dielectric interface under the influence of the applied external field. As a result, an interface charge distribution corresponding to t... | We present what is to our knowledge the most complete 1-D numerical analysis of the evolution and the propagation ::: dynamics of an ultrashort laser pulse in a Ti:Sapphire laser oscillator. This study confirms the dispersion ::: managed model of mode-locking, and emphasizes the role of the Kerr nonlinearity in generat... | eng_Latn | 7,793 |
Effect of deep placement of controlled release nitrogen fertilizer (coated urea) on growth, yield, and nitrogen fixation of soybean plants | Abstract The objective of these studies is to increase the productivity of soybean [Glycine max (L.) Merr. cv. Enrei] with good quality by the application of controlled release nitrogen fertilizers. Soybean was grown in an upland field converted from a drained paddy field in Niigata. The fertilizer treatments were as f... | Abstract CW-pumped Nd:YVO 4 lasers passively Q-switched with LiF : F 2 - and YAG:Cr 4+ saturable absorbers are modeled and comparatively analyzed. The model takes into account the geometric factor representing the distributions of the orientations of F 2 - color centers and Cr 4+ ions relatively to the corresponding cr... | eng_Latn | 7,794 |
Manufacturing PDMS micro lens array using spin coating under a multiphase system | The development of micro lens arrays has garnered much interest due to increased demand of miniaturized systems. Traditional methods for manufacturing micro lens arrays have several shortcomings. For example, they require expensive facilities and long lead time, and traditional lens materials (i.e. glass) are typically... | The method of quantum trajectories is adopted to the problem of laser generation with variable number of active media atoms in the cavity. The approach is applied to an injection-locked sub-Poissonian laser. The onset of laser oscillations is studied for the case of simultaneous start of the injection and pumping. It i... | eng_Latn | 7,795 |
Electrochemical behavior of hemoglobin in neutral surfactants with different poly(ethylene oxide) unit lengths adsorbed on an electrode | The direct electron transfer and adsorption behavior of hemoglobin (Hb) in a series of surfactants with different poly(ethylene oxide) (PEO) unit lengths on a glassy carbon electrode have been studied. With a surfactant of appropriate PEO unit length, the surfactant film-modified electrode exhibited a more stable adsor... | Abstract : We have used an optical parametric oscillator (OPO) to characterize the fiber-optic cache-memory buffers. Prior to addition of the new OPO system, a home-built saturable-absorber mode locked erbium/ytterbium-fiber laser had been used in all our experiments. With the addition of a new OPO, we are able to reme... | eng_Latn | 7,796 |
Electro-optical sampling non-synchronous delay scanning measurement of electron beam bunch length at BFEL | The Electro-optical sampling delay scanning technique can be used for electron beam bunch length measurement.A novel non-synchronous delay scanning technique based on the electro-optical sampling measurements is presented.Based on Beijing Free Electron Laser(BFEL),the electron beam bunch length was ... | This paper proposes a strategy to determine how much a given network can affect the QoS parameters of another, by interference. In order to achieve this, a measurement campaign was carried out in two stages: firstly with a single AP and later with two APs separated by a distance less than three meters, using the same c... | eng_Latn | 7,797 |
Quasi phase matching in GaAs–AlAs superlattice waveguides through bandgap tuning by use of quantum-well intermixing | We report the observation of second-harmonic generation by type I quasi phase matching in a GaAs-AlAs superlattice waveguide. Quasi phase matching was achieved through modulation of the nonlinear coefficient chi((2))(zxy), which we realized by periodically tuning the superlattice bandgap. Second-harmonic generation was... | In this paper, a novel optimization algorithm, termed genetic local search algorithm (GLSA), that combines a genetic algorithm (GA) with a local search technique is proposed to design DOE's. This hybrid algorithm performs an improved, more goal-oriented search compare to a purely GA. A 1:17 cross pattern fan out gratin... | eng_Latn | 7,798 |
Novel Quinidine-Derived Organocatalysts for the Asymmetric Substitutions of O-Boc-Protected Morita–Baylis–Hillman Adducts | A series of novel quinidine-derived organocatalysts was synthesized and utilized for the asymmetric substitution of O-Boc-protected Morita–Baylis–Hillman adducts with various carbamates and tosylcarbamates, affording the corresponding products in good to high yields (up to 91 % yield) with moderate to high ee values (u... | Abstract A laser–diode-pumped passively Q-switched new type crystal Nd 3+ :NaY(WO 4 ) 2 (known as Nd:NYW) laser with GaAs semiconductor saturable absorber has been realized. The dependence of pulse repetition rate, pulse energy, pulse width, and peak power on pump power for different output coupler reflectivities are m... | eng_Latn | 7,799 |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.