Mr. Vladislav F. Efimkov Profile

Vladislav F. Efimkov

at PN Lebedev Physical Institute

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Proceedings Article | 23 August 2007 Paper

Small signal SBS: amplification

I. Bel'dyugin, V. Efimkov, I. Zubarev, S. Mikhailov

Proceedings Volume 6731, 673118 (2007) https://doi.org/10.1117/12.752884

KEYWORDS: Amplifiers, Waveguides, Solids, Phonons, Scattering, Signal attenuation, Mirrors, Phase conjugation, Optical amplifiers, Signal processing

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The amplification of small signals was investigated both experimentally and theoretically. The theoretical analysis was provided in terms of unsaturated regime. It is shown, that it is necessary to take into account the temporal shapes of interacting waves. When pump pulse duration is of the order of hupersound phonons lifetime, the Stokes pulse has duration in two times lower then pump. It is necessary to have time delay between input Stokes pulse and pumping pulse of the order of life time of hupersound phonons to have amplification maximum. Energy amplification ~ 2•10⁹ was obtained experimentally when the energy of input signal was about 10^-11 J. The affect of the active medium SBS - amplifier parameters on SBS threshold is investigated. The universality of expression for a threshold increment of amplification, valid in a big range of change of parameters is shown. The threshold increment of amplification in the light guide in which spontaneous noise can amplify in big solid angle is experimentally confirmed. Experiments on SBS amplification in the light guide of small signal images are carried out. Amplification coefficient ~10⁶ is obtained without essential change of picture quality.

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