Traveling waves in an inhomogeneous oscillation medium
Traveling waves in an inhomogeneous oscillation medium
A.S. Mikhailov, G. Rasul
A traveling wave is considered in an inhomogeneous self-oscillating medium; the wave is partially reflected at the boundary between two regions differing in oscillation frequency.
Show AbstractThe second moment of the magnetic field in a multiscale flow
The second moment of the magnetic field in a multiscale flow
N. Akanbaev
An equation is derived for the second moment of the magnetid field in a random multiscale velocity pattern. An asymptotic study is made for an isotropic multiscale flow having mirror symmetry.
Show AbstractElectron-photon cascade longitudinal-distribution moments
Electron-photon cascade longitudinal-distribution moments
I.P. Ivanenko, V.V. Sizov
The moment method as widely used in cascade theory is extended: scattering and realistic cross sections for other elementary interactions are introduced. A cascade inlet is used in examining the physical and mathematical accuracies.
Show AbstractOptical cross modulation in nematic liquid-crystal films: application to $\chi ^{(3)}$ dispersion measurement on Rayleigh-line flank
Optical cross modulation in nematic liquid-crystal films: application to $\chi ^{(3)}$ dispersion measurement on Rayleigh-line flank
F.N. Gadzhiev, N.I. Koroteev, G.A. Paityan
Amplitude modulation is transferred from one laser beam to another in a planar-oriented mixture of nematic liquid crystals to determine the dispersion in the cubic nonlinearity $\chi ^{(3)}$ at a Rayleigh-line flank with a resolution of a few Hz. The anomalously large values are due in part to the collective behavior in the orientation ordering and in part to the anomalously large $\partial {\epsilon} / \partial T$ and dichroism. Measurements have been made on $x_{ijk}^{3}$, relaxation time, elastic moduli, and thermal diffusivity parallel and transverse to the liquid-crystal director.
Show AbstractTemperature-dependent energy transfer: two-component dye solutions
Temperature-dependent energy transfer: two-component dye solutions
A.N. Ponomarev, A.M. Saletskii, V.I. Yuzhakov
Excitation transfer has been examined for two-component ethanolic dye solutions at various temperature. Molecular association and inhomogeneous broadening affect the migration. The critical radius and the relative rate constants have been determined as functions of temperature.
Show AbstractA Monte Carlo study on energy-transfer time dependence in organic complexes
A Monte Carlo study on energy-transfer time dependence in organic complexes
A.A. Demidov
Monte Carlo calculations with high time resolution have been used to detect the time dependence of the energy transfer in a restricted-volume organic complex of phycobilisome type. A variable time step was used in the calculations to detect the active exciton and perform microscopic calculations on the transfer rate.
Show AbstractDirect observations on the dynamic Stark effect in two-photon absorption and parametric interaction
Direct observations on the dynamic Stark effect in two-photon absorption and parametric interaction
V.V. Krasnikov, M.S. Pshenichnikov, V.S. Solomatin
Measurements have been made on the energy shift in the $4s_{1/2}$ level for the sodium atom in linearly and circularly polarized beams in resonance with the $4s_{1/2} – 4p_{1/2,3/2}$ transition. Two-photon absorption and parametric mixing have been used in the probing. The shift, broadening, and splitting of the $4s_{1/2}$ level have been recorded.
Show AbstractOptical features of a multifiber $Nd^{3+}$ laser
Optical features of a multifiber $Nd^{3+}$ laser
M.L. Karpova, L.S. Kornienko, V.V. Radchenko
A free-running $Nd^{3+}$ multifiber laser has been examined for subthreshold emission and the effects of end reflections on the energy and threshold parameters. Measurements have been made on the spectrum width, pulse length, and divergence as the pumping energy is varied.
Show AbstractContributions from continuum states to the Raman-scattering cross section for the excited hydrogen atom
Contributions from continuum states to the Raman-scattering cross section for the excited hydrogen atom
S.M. Gladkov, A.M. Zheltikov
Perturbation theory is applied to continuum contributions to the Raman-scattering RS cross sections for the hydrogen atom; in some cases, the contributions from continuum states to the scattering cross sections are comparable with those from the discrete spectrum.
Show AbstractThe relation between lasing and fluorescent radiative transport in a lasing system
The relation between lasing and fluorescent radiative transport in a lasing system
M.B. Levin, M.G. Reva, V.V. Rodchenkova, B.M. Uzhinov
Rhodamine 6G has been used with oxazine 17 and cresyl violet, as well as rhodamine C with oxazine 17, to examine the relation between fluorescent radiation transport and lasing as affected by acceptor concentration on laser excitation. Measurements have been made on the acceptor concentrations at which donor lasing ceases, which agree with theoretical estimates derived from the spectra.
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