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10,100 | Numerical Study on Space-Time Pulse Compression | physics.optics | A numerical study of the properties of Gaussian pulses propagating in planar
waveguide under the combined effect of positive Kerr-type nonlinearity,
diffraction in planar waveguides and anomalous or normal dispersion, is
presented. It is demonstrated how the relative strength of dispersion and
diffraction, the strength... | physics |
10,101 | Power Switching in Hybrid Coherent Couplers | physics.optics | We report on a theoretical and numerical investigation of the switching of
power in new hybrid models of nonlinear coherent couplers consisting of optical
slab waveguides with various orders of nonlinearity. The first model consists
of two guides with second-order instead of the usual third-order
susceptibilities as ty... | physics |
10,102 | Stokes Parameters as a Minkowskian Four-vector | physics.optics | It is noted that the Jones-matrix formalism for polarization optics is a
six-parameter two-by-two representation of the Lorentz group. It is shown that
the four independent Stokes parameters form a Minkowskian four-vector, just
like the energy-momentum four-vector in special relativity. The optical filters
are represen... | physics |
10,103 | A Numerical Study of Absorption by Multilayered Biperiodic Structures | physics.optics | We study the electromagnetic scattering by multilayered biperiodic aggregates
of dielectric layers and gratings of conducting plates. We show that the
characteristic lengths of such structures provide a good control of absorption
bands. The influence of the physical parameters of the problem (sizes,
impedances) is disc... | physics |
10,104 | Propagation of a short laser pulse in a plasma | physics.optics | The propagation of an electromagnetic pulse in a plasma is studied for pulse
durations that are comparable to the plasma period. When the carrier frequency
of the incident pulse is much higher than the plasma frequency, the pulse
propagates without distortion at its group speed. When the carrier frequency is
comparable... | physics |
10,105 | Space-Time Approach to Scattering from Many Body Systems | physics.optics | We present scattering from many body systems in a new light. In place of the
usual van Hove treatment, (applicable to a wide range of scattering processes
using both photons and massive particles) based on plane waves, we calculate
the scattering amplitude as a space-time integral over the scattering sample
for an inci... | physics |
10,106 | On Localized "X-shaped" Superluminal Solutions to Maxwell Equations | physics.optics | In this paper we extend for the case of Maxwell equations the "X-shaped"
solutions previously found in the case of scalar (e.g., acoustic) wave
equations. Such solutions are localized in theory, i.e., diffraction-free and
particle-like (wavelets), in that they maintain their shape as they propagate.
In the electromagne... | physics |
10,107 | Scattering Integral Equations for Diffusive Waves. Detection of Objects Buried in Diffusive Media in the Presence of Interfaces | physics.optics | This paper has been withdrawn by the authors until some changes are made. | physics |
10,108 | Thirring Solitons in the presence of dispersion | physics.optics | The effect of dispersion or diffraction on zero-velocity solitons is studied
for the generalized massive Thirring model describing a nonlinear optical fiber
with grating or parallel-coupled planar waveguides with misaligned axes. The
Thirring solitons existing at zero dispersion/diffraction are shown numerically
to be ... | physics |
10,109 | Giant phase-conjugate reflection with a normal mirror in front of an optical phase-conjugator | physics.optics | We theoretically study reflection of light by a phase-conjugating mirror
preceded by a partially reflecting normal mirror. The presence of a suitably
chosen normal mirror in front of the phase conjugator is found to greatly
enhance the total phase-conjugate reflected power, even up to an order of
magnitude. Required co... | physics |
10,110 | A simple method for the determination of slowly varying refractive index profiles from in situ spectrophotometric measurements | physics.optics | Reliable control of the deposition process of optical films and coatings
frequently requires monitoring of the refractive index profile throughout the
layer. In the present work a simple in situ approach is proposed which uses a
WKBJ matrix representation of the optical transfer function of a single thin
film on a subs... | physics |
10,111 | What is the velocity of the electromagnetic field? | physics.optics | A new definition for the electromagnetic field velocity is proposed. The
velocity depends on the physical fields. | physics |
10,112 | Visible light emitting devices with Schottky contacts on silicon nanocrystals | physics.optics | We have fabricated light emitting diodes (LEDs) with Schottky contacts on
Si-nanocrystals formed by simple techniques as used for standard Si devices.
Orange electroluminescence (EL) from these LEDs could be seen with the naked
eye at room temperature when a reverse bias voltage was applied. The EL
spectrum has a major... | physics |
10,113 | Optical microsphere resonators: optimal coupling to high-Q whispering gallery modes | physics.optics | A general model is presented for coupling of high-$Q$ whispering-gallery
modes in optical microsphere resonators with coupler devices possessing
discrete and continuous spectrum of propagating modes. By contrast to
conventional high-Q optical cavities, in microspheres independence of high
intrinsic quality-factor and c... | physics |
10,114 | DC-electric-field-induced and low-frequency electromodulation second-harmonic generation spectroscopy of Si(001)-SiO$_2$ interfaces | physics.optics | The mechanism of DC-Electric-Field-Induced Second-Harmonic (EFISH) generation
at weakly nonlinear buried Si(001)-SiO$_2$ interfaces is studied experimentally
in planar Si(001)-SiO$_2$-Cr MOS structures by optical second-harmonic
generation (SHG) spectroscopy with a tunable Ti:sapphire femtosecond laser. The
spectral de... | physics |
10,115 | Nonlinear phase shift without cascaded second-order processes and third order nonlinearity | physics.optics | The new mechanism for obtaining a nonlinear phase shift has been proposed and
the schemes are described for its implementation. As it is shown, the
interference of two waves with intensity-dependent amplitude ratio coming from
the second harmonic generation should produce the nonlinear phase shift. The
sign and amount ... | physics |
10,116 | Full-vector analysis of a realistic photonic crystal fiber | physics.optics | We analyze the guiding problem in a realistic photonic crystal fiber using a
novel full-vector modal technique, a biorthogonal modal method based on the
nonselfadjoint character of the electromagnetic propagation in a fiber.
Dispersion curves of guided modes for different fiber structural parameters are
calculated alon... | physics |
10,117 | Numerical simulation of gliding reflection of X-ray beam from rough surface | physics.optics | A new method for investigation of x-ray propagation in a rough narrow
dielectric waveguide is proposed on the basis of the numerical integration of
the quazioptical equation. In calculations a model rough surface was used with
the given statistical properties. It was shown that the losses in the narrow
waveguides stron... | physics |
10,118 | Quantum Noise Reduction and Generalized Two-Mode Squeezing in a Cavity Raman Laser | physics.optics | We study a generalized notion of two-mode squeezing for the Stokes and
anti-Stokes fields in a model of a cavity Raman laser, which leads to a
significant reduction in decoherence or quantum noise. The model comprises a
loss-less cavity with classical pump, unsaturated medium and arbitrary
homogeneous broadening and di... | physics |
10,119 | Dispersion-induced generation of higher order transversal modes in singly-resonant optical parametric oscillators | physics.optics | We study the effects of higher order transversal modes in a model of a
singly-resonant OPO, using both numerical solutions and mode expansions
including up to two radial modes. The numerical and two-mode solutions predict
lower threshold and higher conversion than the single-mode solution at negative
dispersion. Relati... | physics |
10,120 | Diffractive effects in singly-resonant continuous-wave parametric oscillators | physics.optics | This paper presents a detailed numerical study of the effect of focusing on
the conversion efficiency of low-loss singly-resonant parametric oscillators
with collinear focusing of pump and signal. Results are given for the maximal
pump depletion and for pump power levels required for various amounts of
depletion, as fu... | physics |
10,121 | Optimal conditions for light pulses coherence transformation in thin nonlinear media | physics.optics | Via solution of appropriate variational problem it is shown that light beams
with Gaussian spatial profile and sufficiently short duration provide maximal
destruction of global coherence under nonlinear self-modulation. | physics |
10,122 | Dynamics of Fabry-Perot resonators with suspended mirrors. I. Nonlinear coupled oscillators | physics.optics | The dynamics of Fabry-Perot cavity with suspended mirrors is described. The
suspended mirrors are nonlinear oscillators interacting with each other through
the laser circulating in the cavity. The degrees of freedom decouple in normal
coordinates, which are the position of the center of mass and the length of the
cavit... | physics |
10,123 | Self-trapping of Necklace beams in Self-focusing Kerr media | physics.optics | We show that an azimuthally-periodically-modulated bright ring "necklace"
beam can self-trap in self-focusing Kerr media and can exhibit stable
propagation for very large distances. These are the first bright (2+1) D beams
to exhibit stable self-trapping in a system described by the cubic (2+1) D
Nonlinear Schrodinger ... | physics |
10,124 | Zeolite-dye micro lasers | physics.optics | We present a new class of micro lasers based on nanoporous molecular sieve
host-guest systems. Organic dye guest molecules of
1-Ethyl-4-(4-(p-Dimethylaminophenyl)-1,3-butadienyl)-pyridinium Perchlorat were
inserted into the 0.73-nm-wide channel pores of a zeolite AlPO$_4$-5 host. The
zeolitic micro crystal compounds wh... | physics |
10,125 | Photonic quantum ring laser | physics.optics | We report a quantum ring-like toroidal cavity naturally formed in a
vertical-cavity-like active microdisk plane due to Rayleigh's band of
whispering gallery modes. The $\sqrt{T}$-dependent redshift and a square-law
property of microampere-range threshold currents down to 2 $\mu$A are
consistent with a photonic quantum ... | physics |
10,126 | Wave channeling of X-rays in narrow rough capillaries - non Andronov-Leontovich theory | physics.optics | The effect of capture of X-ray beam into narrow submicron capillary was
investigated with account for diffraction and decay of coherency by roughness
scattering in transitional boundary layer. In contrast to well-known
Andronov-Leontovich approach the losses do not vanish at zero gliding angle and
scale proportional to... | physics |
10,127 | On The Measurement of Photon Flux in Parametric Down Conversion | physics.optics | We report the measurement of the photons flux produced in parametric
down-conversion, performed in photon counting regime with actively quenched
silicon avalanche photodiodes as single photon detectors. Measurements are done
with the detector in a well defined geometrical and spectral situation. By
comparison of the ex... | physics |
10,128 | The dispersion equation for a wave number of the electromagnetic wave in a random medium of the parallel dielectric cylinders | physics.optics | In a frame of quasi-crystal approximation the dispersion equations are
obtained for the wave vector of a coherent electromagnetic wave propagating in
a media which contains a random set of parallel dielectric cylinders with
possible overlapping. The results are compared with that for the case when a
regularity at the c... | physics |
10,129 | Surface and internal scattering in microspheres: limits imposed on the Q-factor and mode splitting | physics.optics | Accurate calculation of internal and surface scattering losses in fused
silica microspheres is done. We show that in microspheres internal scattering
is partly inhibited as compared to losses in the bulk material. We pay
attention on the effect of frozen thermodynamical capillary waves on surface
roughness. We calculat... | physics |
10,130 | Verification of a localization criterion for several disordered media | physics.optics | We analytically compute a localization criterion in double scattering
approximation for a set of dielectric spheres or perfectly conducting disks
uniformly distributed in a spatial volume which can be either spherical or
layered. For every disordered medium, we numerically investigate a localization
criterion, and exam... | physics |
10,131 | Interferometry of hyper-Rayleigh scattering by inhomogeneous thin films | physics.optics | The use of specific symmetry properties of the optical second-harmonic
generation (the s,s-exclusion rule) has allowed us to observe high-contrast
hyper-Rayleigh interference patterns in a completely diffuse light - an effect
having no analog in case of linear (Rayleigh) scattering. | physics |
10,132 | Self-Pulsating Semiconductor Lasers: Theory and Experiment | physics.optics | We report detailed measurements of the pump-current dependency of the
self-pulsating frequency of semiconductor CD lasers. A distinct kink in this
dependence is found and explained using rate-equation model. The kink denotes a
transition between a region where the self-pulsations are weakly sustained
relaxation oscilla... | physics |
10,133 | Lasing on the D_2 line of sodium in helium atmosphere due to optical pumping on the D_1 line (up-conversion) | physics.optics | A new method is proposed to produce population inversion on transitions
involving the ground state of atoms. The method is realized experimentally with
sodium atoms. Lasing at the frequency corresponding to the sodium D_2 line is
achieved in the presence of pump radiation resonant to the D_1 line with helium
as a buffe... | physics |
10,134 | Optics of Nonuniformly Moving Media | physics.optics | A moving dielectric appears to light as an effective gravitational field. At
low flow velocities the dielectric acts on light in the same way as a magnetic
field acts on a charged matter wave. We develop in detail the geometrical
optics of moving dispersionless media. We derive a Hamiltonian and a Lagrangian
to describ... | physics |
10,135 | Observation of Nonlinear Mode in a Cylindrical Fabry-Perot Cavity | physics.optics | We report the first observation of a nonlinear mode in a cylindrical
nonlinear Fabry-Perot cavity. The field enhancement from cavity buildup, as
well as the large chi3 optical nonlinearity due to resonantly-excited Rb-85
vapor, allows the nonlinear mode to form at low incident optical powers of less
than a milliwatt. T... | physics |
10,136 | Optical second harmonic generation probe of two-dimensional ferroelectricity | physics.optics | Optical second harmonic generation (SHG) is used as a noninvasive probe of
two-dimensional (2D) ferroelectricity in Langmuir-Blodgett (LB) films of
copolymer vinylidene fluoride with trifluorethylene. The surface 2D
ferroelectric-paraelectric phase transition in the topmost layer of LB films
and a thickness independent... | physics |
10,137 | All Optical Flip-Flop Based on Coupled Laser Diodes | physics.optics | An all optical set-reset flip flop is presented that is based on two coupled
identical laser diodes. The lasers are coupled so that when one of the lasers
lases it quenches lasing in the other laser. The state of the flip flop is
determined by which laser is currently lasing. Rate equations are used to model
the flip f... | physics |
10,138 | HeXLN: A 2-Dimensional nonlinear photonic crystal | physics.optics | We report on the fabrication of what we believe is the first example of a two
dimensional nonlinear periodic crystal\cite{berger}, where the refractive index
is constant but in which the 2nd order nonlinear susceptibility is spatially
periodic. Such a crystal allows for efficient quasi-phase matched 2nd harmonic
genera... | physics |
10,139 | Effect of laser polarization in laser-assisted electron-helium inelastic collisions:a sturmian approach | physics.optics | The influence of linearly and circularly polarized laser fields on the
dynamics of fast electron-impact excitation in atomic helium is discussed. A
detailed analysis is made in the excitation of 2^1S, 3^1S and 3^1D dressed
states of helium target. | physics |
10,140 | Theoretical Study of Quantum Dissipation and Laser Noise Effects on the Atomic Response | physics.optics | The nonlinear dynamics of dissipative quantum systems in incoherent laser
fields is studied in the framework of master equation with random model
describing the laser noise and Markovian approximation for dealing with the
system-bath couplings. | physics |
10,141 | The Kinetic of the Atomic Relaxation Induced by Laser Noise | physics.optics | We present a theoretical study of strong laser-atom interactions, when the
laser field parameters are subjected to random processes. The atom is modelled
by a two-level and three-level systems, while the statistical fluctuations of
the laser field are described by a pre-Gaussian model. | physics |
10,142 | Polarized Electromagnetic Radiation from Spatially Correlated Sources | physics.optics | We consider the effect of spatial correlations on sources of polarized
electromagnetic radiation. The sources, assumed to be monochromatic, are
constructed out of dipoles aligned along a line such that their orientation is
correlated with their position. In one representative example, the dipole
orientations are prescr... | physics |
10,143 | Hierarchy of time scales and quasitrapping in the N-atom micromaser | physics.optics | We study the dynamics of the reduced density matrix(RDM) of the field in the
micromaser. The resonator is pumped by N-atomic clusters of two-level atoms. At
each given instant there is only one cluster in the cavity. We find the
conditions of the independent evolution of the matrix elements of RDM belonging
to a (sub)d... | physics |
10,144 | Dynamics of Atom-Mediated Photon-Photon Scattering II: Experiment | physics.optics | Temporal and angular correlations in atom-mediated photon-photon scattering
are measured. Good agreement is found with the theory presented in Part~I. | physics |
10,145 | Dynamics of Atom-Mediated Photon-Photon Scattering I: Theory | physics.optics | The mediated photon-photon interaction due to the resonant Kerr nonlinearity
in an inhomogeneously broadened atomic vapor is considered. The time-scale for
photon-photon scattering is computed and found to be determined by the
inhomogeneous broadening and the magnitude of the momentum transfer. This time
can be shorter... | physics |
10,146 | Interfering with Interference: a Pancharatnam Phase Polarimeter | physics.optics | A simple variation of the traditional Young's double slit experiment can
demonstrate several subtleties of interference with polarized light, including
Berry and Pancharatnam's phase. Since the position of the fringes depends on
the polarization state of the light at the input, the apparatus can also be
used to measure... | physics |
10,147 | Soliton electro-optic effects in paraelectrics | physics.optics | The combination of charge separation induced by the formation of a single
photorefractive screening soliton and an applied external bias field in a
paraelectric is shown to lead to a family of useful electro-optic guiding
patterns and properties. | physics |
10,148 | Femtosecond soliton amplification in nonlinear dispersive traps and soliton dispersion management | physics.optics | The nonlinear pulse propagation in an optical fibers with varying parameters
is investigated. The capture of moving in the frequency domain femtosecond
colored soliton by a dispersive trap formed in an amplifying fiber makes it
possible to accumulate an additional energy and to reduce significantly the
soliton pulse du... | physics |
10,149 | Jaynes-Cummings model with degenerate atomic levels | physics.optics | The Jaynes-Cummings model describing the interaction of a single linearly-
polarized mode of the quantized electromagnetic field with an isolated two-
level atom is generalized to the case of atomic levels degenerate in the
projections of the angular momenta on the quantization axis, which is a usual
case in the experi... | physics |
10,150 | Axicon Gaussian Laser Beams | physics.optics | We deduce the simplest form for an axicon Gaussian laser beam, i.e., one with
radial polarization of the electric field. | physics |
10,151 | Diffraction as a Consequence of Faraday's Law | physics.optics | We consider a linearly polarized electromagnetic wave incident on an opaque
screen with square aperture of edge a. An application of Faraday's law to a
loop parallel to the screen, on the side away from the source, shows that the
wave must have longitudinal components there. The ratio of the longitudinal to
transverse ... | physics |
10,152 | Time-Reversed Diffraction | physics.optics | We show that a time-reversed formulation of Huygens-Kirchhoff diffraction can
be used to deduce the transverse and longitudinal fields of a Gaussian laser
beam, starting from a simple assumption of a Gaussian beam profile in the far
field. An attempt to apply this technique to the far fields of a Hertzian
dipole shows ... | physics |
10,153 | Ultrahigh sensitivity of slow-light gyroscope | physics.optics | Slow light generated by Electromagnetically Induced Transparency is extremely
susceptible with respect to Doppler detuning. Consequently, slow-light
gyroscopes should have ultrahigh sensitivity. | physics |
10,154 | Second-harmonic interferometric spectroscopy of the buried Si(111)-SiO$_2$ interface | physics.optics | The second-harmonic interferometric spectroscopy (SHIS) which combines both
amplitude (intensity) and phase spectra of the second-harmonic (SH) radiation
is proposed as a new spectroscopic technique being sensitive to the type of
critical points (CP's) of combined density of states at semiconductor surfaces.
The increa... | physics |
10,155 | Frequency stabilization of a monolithic Nd:YAG ring laser by controlling the power of the laser-diode pump source | physics.optics | The frequency of a 700mW monolithic non-planar Nd:YAG ring laser (NPRO)
depends with a large coupling coefficient (some MHz/mW) on the power of its
laser-diode pump source. Using this effect we demonstrate the frequency
stabilization of an NPRO to a frequency reference by feeding back to the
current of its pump diodes.... | physics |
10,156 | Polarization Dependence of Emissivity | physics.optics | We deduce the emissivity of radiation from a metallic surface as a function
of angle and polarization. This effect has found application in the calibration
of detectors for cosmic microwave background radiation. | physics |
10,157 | Modulation Instability and Pattern Formation in Spatially Incoherent Light Beams | physics.optics | We present the first experimental observation of modulation instability of
partially spatially incoherent light beams in non-instantaneous nonlinear
media. We show that even in such a nonlinear partially coherent system (of
weakly-correlated particles) patterns can form spontaneously. Incoherent MI
occurs above a speci... | physics |
10,158 | Spectral Dependence of Polarized Radiation due to Spatial Correlations | physics.optics | We study the polarization of light emitted by spatially correlated sources.
We show that in general polarization acquires nontrivial spectral dependence
due to spatial correlations. The spectral dependence is found to be absent only
for a special class of sources where the correlation length scales as the
wavelength of... | physics |
10,159 | Stable oscillating nonlinear beams in square-wave-biased-photorefractives | physics.optics | We demonstrate experimentally that in a centrosymmetric paraelectric
non-stationary boundary conditions can dynamically halt the intrinsic
instability of quasi-steady-state photorefractive self-trapping, driving beam
evolution into a stable oscillating two-soliton-state configuration. | physics |
10,160 | Comment on "Observation of Superluminal Behaviors in Wave Propagation" | physics.optics | Mugnai et al. have reported an experiment in which microwave packets appear
to travel in air with a speed substantially greater than c. They calculate the
group velocity of their packets and find that it agrees with their experimental
result. That calculation is incorrect. A correct calculation gives a group
velocity l... | physics |
10,161 | Bessel Beams | physics.optics | Scalar Bessel beams are derived both via the wave equation and via
diffraction theory. While such beams have a group velocity that exceeds the
speed of light, this is a manifestation of the "scissors paradox" of special
relativty. The signal velocity of a modulated Bessel beam is less than the
speed of light. Forms of ... | physics |
10,162 | Symmetries of Optical Phase Conjugation | physics.optics | Various algebraic structures of degenerate four-wave mixing equations of
optical phase conjugation are analyzed. Two approaches (the spinorial and the
Lax-pair based), complementary to each other, are utilized for a systematic
derivation of conserved quantities. Symmetry groups of both the equations and
the conserved q... | physics |
10,163 | Extinction theorem for ultrafast pulses | physics.optics | Instead of using frequency dependent refractive index, we propose to use the
extinction theorem to describe reflection and transmission of an ultrashort
pulse passing through the boundary. When the duration of the pulse is
comparable with the relaxation time, the results differ significantly from
those given by the tra... | physics |
10,164 | Polarization Elements-A Group Theoretical Study | physics.optics | The Classification of Polarization elements, the polarization affecting
optical devices which have a Jones matrix representation, according to the
types of eigenvectors they possess, is given a new visit through the
Group-theoretical connection of polarization elements. The diattenuators and
retarders are recognized as... | physics |
10,165 | Strong Discontinuities in the Complex Photonic Band Structure of Transmission Metallic Gratings | physics.optics | Complex photonic band structures (CPBS) of transmission metallic gratings
with rectangular slits are shown to exhibit strong discontinuities that are not
evidenced in the usual energetic band structures. These discontinuities are
located on Wood's anomalies and reveal unambiguously two different types of
resonances, wh... | physics |
10,166 | Slow light | physics.optics | We present a brief classical discussion of a process to reduce the group
velocity of an electromagnetic pulse by many orders of magnitude. | physics |
10,167 | A Variational Approach in the Dissipative Nonlinear Schrödinger Equation | physics.optics | The properties of pulse propagation in a nonlinear fiber including linear
damped term added in the usual nonlinear Schr\"odinger equation is analyzed
analytically. We apply variational modified approach based on the lagrangian
that describe the dynamic of system and with a trial function we obtain a
solution which is m... | physics |
10,168 | Negative Group Velocity | physics.optics | The group velocity for pulses in an optical medium can be negative at
frequencies between those of a pair of laser-pumped spectral lines. The gain
medium then can amplify the leading edge of a pulse resulting in a time advance
of the pulse when it exits the medium, as has been recently demonstrated in the
laboratory. T... | physics |
10,169 | Possibility of a Light Pulse with Speed Greater than c | physics.optics | In two models it is shown that a light pulse propagates from a vacuum into
certain media with velocity greater than that of a light in a vacuum (c). By
numerical calculation the propagating properties of such a light are given. | physics |
10,170 | Theory of sub-10 fs Generation in Kerr-lens Mode-locked Solid-State Lasers with a Coherent Semiconductor Absorber | physics.optics | The results of the study of ultra-short pulse generation in continuous-wave
Kerr-lens mode-locked (KLM) solid-state lasers with semiconductor saturable
absorbers are presented. The issues of extremely short pulse generation are
addressed in the frames of the theory that accounts for the coherent nature of
the absorber-... | physics |
10,171 | Soliton Generation and Picosecond Collapse in Solid-State Lasers with Semiconductor Saturable Absorber | physics.optics | Based on self - consistent field theory we study a soliton generation in cw
solid-state lasers with semiconductor saturable absorber. Various soliton
destabilizations, i.e. the switch from femtosecond to picosecond generation
(''picosecond collapse''), an automodulation regime, breakdown of soliton
generation and hyste... | physics |
10,172 | On the sensitivity of wave channeling of X-ray beam to the shape of interface channels | physics.optics | The effect of transmission of x-ray beams through submicron capillaries was
investigated with account for diffraction and roughness scattering. Possible
explanation of anomalous energy dependence of transmission through thin Cr/C/Cr
channeles was given due to effect of periodic deformations. | physics |
10,173 | Automodulations in Kerr-lens Modelocked Solid-State Lasers | physics.optics | Nonstationary pulse regimes associated with self modulation of a Kerr-lens
modelocked Ti:sapphire laser have been studied experimentally and
theoretically. Such laser regimes occur at an intracavity group delay
dispersion that is smaller or larger than what is required for stable
modelocking and exhibit modulation in p... | physics |
10,174 | Investigation of the Kerr-lens Mode Locking Ability of Cr:ZnSe Solid-State Laser | physics.optics | The theoretical calculation for nonlinear refractive index in Cr: ZnSe -
active medium predicts the strong defocusing cascaded second-order nonlinearity
within 2000 - 3000 nm spectral range. On the basis of this result the optimal
cavity configuration for Kerr-lens mode locking is proposed that allows to
achieve a sub-... | physics |
10,175 | Nonlinear Effects in CW Mode-Locked Solid-State Lasers with Semiconductor Saturable Absorbers | physics.optics | The influence of nonlinear properties of semiconductor saturable absorbers on
ultrashort pulse generation was investigated. It was shown, that linewidth
enhancement, quadratic and linear ac Stark effect contribute essentially to the
mode locking in cw solid-state lasers, that can increase the pulse stability,
decrease ... | physics |
10,176 | Large Coherence Area Thin-Film Photonic Stop-Band Lasers | physics.optics | We demonstrate that the shift of the stop band position with increasing
oblique angle in periodic structures results in a wide transverse exponential
field distribution corresponding to strong angular confinement of the
radiation. The beam expansion follows an effective diffusive equation depending
only upon the spectr... | physics |
10,177 | Phase-coherent frequency measurement of the Ca intercombination line at 657 nm with a Kerr-lens mode-locked femtosecond laser | physics.optics | The frequency of the Calcium ^3P_1--^1S_0 intercombination line at 657 nm is
phase-coherently measured in terms of the output of a primary cesium frequency
standard using an optical frequency comb generator comprising a sub-10 fs
Kerr-lens mode-locked Ti:Sapphire laser and an external microstructure fiber
for self-phas... | physics |
10,178 | A phase-locked frequency divide-by-3 optical parametric oscillator | physics.optics | Accurate phase-locked 3:1 division of an optical frequency was achieved, by
using a continuous-wave (cw) doubly resonant optical parametric oscillator. A
fractional frequency stability of 2*10^(-17) of the division process has been
achieved for 100s integration time. The technique developed in this work can be
generali... | physics |
10,179 | Electromagnetic oscillations in periodic mediums outside the passbands | physics.optics | It was usually assumed that the resonator based on a waveguide has the eigen
oscillations that are formed by interference of two waves which propagate in
different directions and have equal amplitudes. These patterns are usually
called standing waves. We have shown that the eigen oscillations of a resonator
which is fi... | physics |
10,180 | Theory of self phase-locked optical parametric oscillators | physics.optics | The plane-wave dynamics of 3*omega => (2*omega, omega) subharmonic optical
parametric oscillators containing a second harmonic generator of the idler wave
omega is analyzed analytically by using the meanfield approximation and
numerically by taking into account the field propagation inside the media. The
resonant Chi(2... | physics |
10,181 | Mach-Zehnder interferometer based all optical flip-flop | physics.optics | For the first time an all optical flip-flop is demonstrated based on two
coupled Mach-Zehnder interferometers which contain semiconductor optical
amplifiers in their arms. The flip-flop operation is discussed and it is
demonstrated using commercially available fiber pigtailed devices. Being based
on Mach-Zehnder interf... | physics |
10,182 | Anisotropic charge displacement supporting isolated photorefractive optical needles | physics.optics | The strong asymmetry in charge distribution supporting a single
non-interacting spatial needle soliton in a paraelectric photorefractive is
directly observed by means of electroholographic readout. Whereas in trapping
conditions a quasi-circular wave is supported, the underlying double-dipolar
structure can be made to ... | physics |
10,183 | Parametric Processes in a Strong-Coupling Planar Microcavity | physics.optics | I present a theoretical treatment of parametric scattering in strong coupling
semiconductor microcavities to model experiments in which parametric oscillator
behaviour has been observed. The model consists of a non-linear excitonic
oscillator coupled to a cavity mode which is driven by the external fields, and
predicts... | physics |
10,184 | Spectral Characteristics of Ultrashort Pulses in Kerr-lens Mode-Locked Lasers | physics.optics | A number of factors that influence spectral position of the femtosecond pulse
in a Kerr-lens modelocked Cr:LiSGaF laser have been identified: high-order
dispersion, gain saturation, reabsorption from the ground state, and stimulated
Raman scattering. Using the one-dimensional numerical model for the simulation
of the l... | physics |
10,185 | On the origin of the optical nonlinearity of a gallium-silica interface | physics.optics | Simultaneous measurements of the intensity and phase of a probe wave
reflected from an interface between silica and elemental alpha-gallium reveal
its very strong optical nonlinearity, affecting both these parameters of the
reflected wave. The data corroborate with a non-thermal mechanism of optical
response which assu... | physics |
10,186 | Signal velocity, causality, and quantum noise in superluminal light pulse propagation | physics.optics | We consider pulse propagation in a linear anomalously dispersive medium where
the group velocity exceeds the speed of light in vacuum (c) or even becomes
negative. A signal velocity is defined operationally based on the optical
signal-to-noise ratio, and is computed for cases appropriate to the recent
experiment where ... | physics |
10,187 | Polarization dynamics of femtosecond pulses propagating in air | physics.optics | Polarization dynamics of femtosecond light pulses propagating in air is
studied by computer simulation. A rich variety of dynamics is found that
depends on the initial polarization state and power of the pulse. Effects of
polarization on the plasma and supercontinuum generation are also discussed. | physics |
10,188 | Two-photon absorption in potassium niobate | physics.optics | We report measurements of thermal self-locking of a Fabry-Perot cavity
containing a potassium niobate (KNbO3) crystal. We develop a method to
determine linear and nonlinear optical absorption coefficients in intracavity
crystals by detailed analysis of the transmission lineshapes. These lineshapes
are typical of optica... | physics |
10,189 | Analysis of Optical Pulse Propagation with ABCD Matrices | physics.optics | We review and extend the analogies between Gaussian pulse propagation and
Gaussian beam diffraction. In addition to the well-known parallels between
pulse dispersion in optical fiber and CW beam diffraction in free space, we
review temporal lenses as a way to describe nonlinearities in the propagation
equations, and th... | physics |
10,190 | Absolute frequency measurement of the 171Yb+ clock transition with a Kerr-lens mode-locked femtosecond laser | physics.optics | We have measured the frequency of the $6s^2S_{1/2} - 5d^2D_{3/2}$
electric-quadrupole transition of $^{171}$Yb$^+$ with a relative uncertainty of
$1\times 10^{-14}$, $\nu_{Yb}$ = 688 358 979 309 312 Hz $\pm$ 6 Hz. A
femtosecond frequency comb generator was used to phase-coherently link the
optical frequency derived fro... | physics |
10,191 | Nonlocal reflection by photonic barriers | physics.optics | The time behaviour of microwaves undergoing partial reflection by photonic
barriers was measured in the time and in the frequency domain. It was observed
that unlike the duration of partial reflection by dielectric layers, the
measured reflection duration of barriers is independent of their length. The
experimental res... | physics |
10,192 | Conditions for Soliton-Like Wave Propagation in Pockels and Photorefractive Media | physics.optics | We study the conditions for soliton-like wave propagation in the
Photorefractive (PR) and electro-optic (i.e., Pockels) material, by using
Nonlinear Schrodinger (NLS) equation. The complete NLS equation is solved
analytically and numerically by transforming it into the phase space. Our
results clearly show the existenc... | physics |
10,193 | Bifurcation of gap solitons through catastrophe theory | physics.optics | In the theory of optical gap solitons, slowly-moving finite-amplitude
Lorentzian solutions are found to mediate the transition from bright to
coexistent dark-antidark solitary wave pairs when the laser frequency is
detuned out of the proper edge of a dynamical photonic bandgap. Catastrophe
theory is applied to give a g... | physics |
10,194 | Direct Determination of Harmonic and Inter-modulation distortions with an application to Single Mode Laser Diodes | physics.optics | Harmonic and Intermodulation distortions occur when a physical system is
excited with a single or several frequencies and when the relationship between
the input and output is non-linear. Working with non-linearities in the
Frequency domain is not straightforward specially when the relationship between
the input and ou... | physics |
10,195 | Understanding multilayers from a geometrical viewpoint | physics.optics | We reelaborate on the basic properties of lossless multilayers. We show that
the transfer matrices for these multilayers have essentially the same algebraic
properties as the Lorentz group SO(2,1) in a (2+1)-dimensional spacetime, as
well as the group SL(2,R) underlying the structure of the ABCD law in
geometrical opti... | physics |
10,196 | Electromagnetic diffraction by a circular cylinder with longitudinal slots | physics.optics | A method is presented to investigate diffraction of an electromagnetic plane
wave by an infinitely thin infinitely conducting circular cylinder with
longitudinal slots. It is based on the use of the combined boundary conditions
method that consists on expressing the continuity of the tangential components
of both the e... | physics |
10,197 | High-resolution Doppler-free molecular spectroscopy with a continuous-wave optical parametric oscillator | physics.optics | We present a reliable, narrow linewidth (100 kHz) continuous-wave optical
parametric oscillator (OPO) suitable for high-resolution spectroscopy
applications. The OPO is based on a periodically-poled lithium-niobate crystal
and features a specially designed intracavity etalon which permits its
continuous tuning and stab... | physics |
10,198 | Fresnel coefficients as hyperbolic rotations | physics.optics | We describe the action of a plane interface between two semi-infinite media
in terms of a transfer matrix. We find a remarkably simple factorization of
this matrix, which enables us to express the Fresnel coefficients as a
hyperbolic rotation. | physics |
10,199 | Static and Dynamic Regimes of Arbitrary Gain Compensation Single-Mode Laser Diodes | physics.optics | We report on a methodology for the evaluation of the DC characteristics,
small-signal frequency response and large-signal dynamic response of carrier
and photon density responses in semiconductor laser diodes. A single mode laser
is considered and described with a pair of rate equations containing a novel
non-linear ga... | physics |
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