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Soviet Journal of Quantum Electronics

Wavefront reversal based on anti-Stokes stimulated Raman scattering

Igor' M Bel'dyugin, E M Zemskov, V N Klushin, Vladimir N. Seminogov

Published Nov 30, 1979• 4 citations
Publisher

Abstract

It is shown that wavefront reversal with a frequency shift is possible in axial anti-Stokes stimulated Raman scattering. The similarities and differences between this scheme and the phase conjugacy schemes proposed earlier are discussed. It is shown that the proposed scheme extends the class of processes in which wavefront reversal may be observed.

DOI
10.1070/qe1979v009n11abeh009775

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Soviet Journal of Quantum Electronics•Sep 30, 1982•0 citations
It is shown that wavefront reversal with a frequency shift is possible in axial anti-Stokes stimulated Raman scattering. The similarities and differences between this scheme and the phase conjugacy schemes proposed earlier are discussed. It is shown that the proposed scheme extends the class of processes in which wavefront reversal may be observed.
A theory of nonstationary stimulated Raman scattering is developed, allowing for the coupling between the Stokes and anti-Stokes waves. The main equations are solved in the asymptotic approximation, which is valid for large values of the gain. The dependences of the gain on the phase mismatch Δ k , pulse duration τ p , and cell length l are discussed and the optimal angle for the observation of the anti-Stokes rings is calculated. Moreover, the spectral distributions of the Stokes and anti-Stokes waves are considered.
A calculation is made of the intensity of the Stokes radiation in the stimulated Raman scattering of ultrashort light pulses in a dispersive medium employing the asymptotic approximation for arbitrary modulation of the amplitude and phase of the pump pulse. Particular attention was paid to the effect of phase modulation on the stimulated Raman scattering. Calculations were also made of the intensity of the anti-Stokes component in the scattering of an ultrashort pulse in a dispersive medium and of the optimal angle for the observation of the anti-Stokes rings.
It is shown that transient anti-Stokes stimulated Raman scattering (SRS) acts as a vacuum field fluctuations amplifier at Stokes frequency, the fluctuations being amplified up to macroscopic values. This makes their investigation possible by studying macroscopic energy fluctuations of transient SRS anti-Stokes pulses. The proposed theory also gives a quantitative description of angular distribution of self-generated anti-Stokes emission around the exact phase-matching angle recently observed by Duncan et al. ( Opt. Lett. , 11 (1986) 803) in the transient regime.
An analysis is made of distortions of the reversed wave in stimulated backscattering of light (backward WFR) caused by frequency and angular shifts of the scattered wave relative to the pump wave. The scattered field is expressed in the form of a series in terms of orthogonalized specklons comprising the reversed pump field and its transverse derivatives. It is found that for backward WFR with a frequency detuning Δω, the Stokes field ES(r, z) is not closest to the pump field E*L (r, z) to a field in the shifted plane E*L (r, z + Δz), where Δz=2Δω/Δg, g is the gain. Similar results are also obtained for an angular shift.