Coherent Raman mixing in a vibrator
Coherent Raman mixing in a vibrator
S.I. Воndаrenко, Yu.E. D'уакоv, S.Yu. Niкitin
Generation of IR radiation on the basis of coherent Raman mixing in a vibrator is examined. It is shown that the use of a vibrator makes possible a significant (10 to 100 fold) gain in generation efficiency, particularly in the long-wave region.
Show AbstractNonlinear plane waves generated by moving space distributed monochromatic sources
Nonlinear plane waves generated by moving space distributed monochromatic sources
V.E. Gusev
It is suggested that nonlinear acoustic waves excited by distributed sources be analyzed by a nonhomogeneous equation of simple waves. An analytic description is obtained of the generation of intensive sound in a periodically strictive field, produced by two head-on laser beams. A set of coupled quasilinear equations describing the behavior of the incident and reflected waves in a slightly nonhomogeneous medium is obtained. It is shown that the mathematical tools developed in the present paper are suitable in the case of periodic nonhomogeneities.
Show AbstractCalculating of optimal parameters of resonator of gasdynamical laser from given characteristics of flow
Calculating of optimal parameters of resonator of gasdynamical laser from given characteristics of flow
D.G. Bakanov, A.I. Odintsov, A.I. Fedoseev
The effect of the parameters of the active medium of a gasdynamic laser on the optimal parameters of an optical vibrator and its energy efficiency are investigated analytically. The results are of practical significance for designing optical vibrators of gasdynamic lasers.
Show AbstractOn the NN-forces investigation from N+d → 3N reactions at low energies
On the NN-forces investigation from N+d → 3N reactions at low energies
M.S. Golovkov, M.I. Zhurina, S.N. Kondrat'ev, T.N. Mikhaleva, A.M. Pоpоva, D.L. Сhuprunоv
A method is suggested for determining the potential of the nuclear N-N interaction from analysis of experimental data on nucleon-induced deutron decay at low energies on the basis of an exact solution of the integral equations of the three-body problem. To perform this study we measured the two-dimensional spectra of coincidence of protons from the d + p → p + p + n reaction with deutron energies of 14.2 and 12.8 MeV at different proton angles of emission.
Show AbstractInfluence of the phase distribution on the coherent radiation of a relativistic beam in synchrotron and ondulator
Influence of the phase distribution on the coherent radiation of a relativistic beam in synchrotron and ondulator
I.V. Lupandin
The article presents a derivation of a formula for the intensity of radiation due interference in a synchrotron and undulator. It is shown that the radiation intensity is a function of the parameters of the coordinate and velocity distribution of particles. Exponential damping of radiation at high frequencies is controlled by the ratio of the minimum spatial parameter of the beam to the emitted wavelength.
Show AbstractShort range order in the cluster model of alloy in the coheren-potential approximation
Short range order in the cluster model of alloy in the coheren-potential approximation
I.G. Batyrev, A.A. Katsnel'son
The density of electron states of binary alloys with short-range order, calculated in the cluster approximation of the coherent-potential method, is used for determining the configuration part of the total energy of solid solutions. On the basis of this we estimated the sign of the short-range order parameter at the first coordination sphere in certain systems of transition elements. The values of these parameters for the majority of the alloys under study were found to be of the same sign as the experimental results, obtained by diffusive scattering methods.
Show AbstractThe investigation of the fast electrons energy distribution in the positive column and negative glow of the low pressure helium discharge
The investigation of the fast electrons energy distribution in the positive column and negative glow of the low pressure helium discharge
L.M. Vоlкоva, A.M. Devyatov, E.A. Кral'kina, A.V. Kuralova
The variation in the rapid electron energy distribution function vs the location of the observation point in a low-pressure discharge in helium is investigated. The helium pressures were 2.5 * $10^{-2}$,5 * $10^{-2}$, 0.3 and 0.1 mm Hg, $i_{dis}$ = 25 mA. The distribution function was calculated from dis measured spectral line intensities by solving the invesrse problem using the regularization method.
Show AbstractExperimental characteristics of parametrical generator on MIS-varactors
Experimental characteristics of parametrical generator on MIS-varactors
V.F. Vinyarskii, V.F. Marchenko
The principal characteristics of Al—SiО$_2$/Si_{3}$N$_{4}$—Si based film-type MIS varactors suitable for operation within the rf range are examined. Results of an experimental study of a two-circuit balanced parametric oscillator employing MIS varactors are presented. It is established that this device differs in a number of ways from the familiar parametric oscillator employing barrier-type varactors.
Show AbstractInvestigation of droplet formation phenomenon under light irradiation of capillary films
Investigation of droplet formation phenomenon under light irradiation of capillary films
В.A. Вesuglуi, V.V. Nizоvtsev
Experimental results are presented on the study of photoinduced formation of droplets in thin layers of solutions and melts of certain molecular compounds. When a thin layer of melt or solution with open surface was irradiated in a tray, we observed stratification of the liquid, resulting in the formation of an isolated moving droplet, which is preceded by appearance of surface irregularities and break of the film due to local increase in the surface tension attendant to evaporation of the solvent. The droplet follows the light spot on the tray surface and is enriched by the less volatile component of the solution. The motion of the droplet is induced by movement of the wetting field in the field of the temperature gradient.
Show AbstractInfluence of copper on stability of structure C14 in quasi-binary Еr(Mn$_{1-x}$Cu$_{x}$)$_2$ system
Influence of copper on stability of structure C14 in quasi-binary Еr(Mn$_{1-x}$Cu$_{x}$)$_2$ system
A.S. Ilyushin, V.Т. Grebjonkin, L.A. Kirilicheva
X-ray analysis of polycrystals is employed for investigating the effect of isomorphic replacement of manganese by copper in the Еr(Mn$_{1-x}$Cu$_{x}$)$_2$ system on the stability of the hexagonal, densely-packed Cl4 structure. It is established that isomorphic replacement of manganese by copper destabilizes the Cl4 structure and results in the formation of deformation and twinning type packing defects. The concentration of packing of both types for Intermetallic compounds of both types is determined experimentally.
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