Faculty of Physics
M.V.Lomonosov Moscow State University

## Coherent Raman mixing in a vibrator

### S.I. Воndаrenко, Yu.E. D'уакоv, S.Yu. Niкitin

Moscow University Physics Bulletin 1981. 36. N 6. P. 1

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.

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## Nonlinear plane waves generated by moving space distributed monochromatic sources

### V.E. Gusev

Moscow University Physics Bulletin 1981. 36. N 6. P. 7

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.

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## Calculating of optimal parameters of resonator of gasdynamical laser from given characteristics of flow

### D.G. Bakanov, A.I. Odintsov, A.I. Fedoseev

Moscow University Physics Bulletin 1981. 36. N 6. P. 13

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.

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## 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

Moscow University Physics Bulletin 1981. 36. N 6. P. 18

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.

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## Influence of the phase distribution on the coherent radiation of a relativistic beam in synchrotron and ondulator

### I.V. Lupandin

Moscow University Physics Bulletin 1981. 36. N 6. P. 23

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.

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## Short range order in the cluster model of alloy in the coheren-potential approximation

### I.G. Batyrev, A.A. Katsnel'son

Moscow University Physics Bulletin 1981. 36. N 6. P. 27

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.

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## 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

Moscow University Physics Bulletin 1981. 36. N 6. P. 33

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.

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## Experimental characteristics of parametrical generator on MIS-varactors

### V.F. Vinyarskii, V.F. Marchenko

Moscow University Physics Bulletin 1981. 36. N 6. P. 37

### V.L. Korotkikh, К.К. Krupnikov

Moscow University Physics Bulletin 1981. 36. N 6. P. 104

## The analysis of generation of supershort pulses by synchronous pumping of four level media

### V.A. Nekhaenko

Moscow University Physics Bulletin 1981. 36. N 6. P. 108