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Soviet Journal of Quantum Electronics

Strong reflection of a series of pulses from a four-wave mirror with thermal nonlinearity under parametric feedback conditions

M S Barashkov, Igor' M Bel'dyugin, Mark V. Zolotarev, Yu I Kruzhilin, М. И. Крымский, S P Oshkin, Г.С. Старков, A F Umnov, M A Kharchenko

Published Apr 30, 1989• 6 citations
Publisher

Abstract

Strong reflection of a series of pulses from a four-wave mirror with thermal nonlinearity under parametric feedback conditions, M S Barashkov, Igor' M Bel'dyugin, M V Zolotarev, Yu I Kruzhilin, M I Krymskiĭ, S P Oshkin, G S Starkov, A F Umnov, M A Kharchenko
DOI
10.1070/qe1989v019n04abeh007909

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Soviet Journal of Quantum Electronics•Apr 30, 1989•2 citations
Dynamics of reflection from a thermal self-pumped four-wave mirror with a YAG:Nd amplifier in a feedback loop is modeled mathematically. It is shown that an allowance for the transient nature of the process, for magnification by telescopes, for different transmissions of waves with orthogonal polarizations by a dielectric polarizer and a nonreciprocal element, and particularly for depletion of the population inversion in the amplifier makes it possible to describe this mirror and to optimize its operation in accordance with real experimental conditions even when the plane-wave approximation is used.
A theoretical analysis is made of the efficiency of typical ring systems of phase-conjugating mirrors utilizing a degenerate four-wave interaction in media with a thermal nonlinearity. The analysis is made for steady-state conditions taking into account wave saturation effects in an amplifier situated in a positive feedback circuit. It is shown that the reflection coefficient in these systems is extremely sensitive to the level of the phase-conjugate signal (as the ratio of the signal intensity to the saturation intensity of the amplifier active medium is increased, the reflection coefficient of the ring phase-conjugating mirror decreases sharply). It is also found that at a high level of the nonlinearity and for an appreciable gain per pass, these systems exhibit multistability (i.e., several different steady states exist).