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ZhETF Pisma Redaktsiiu

Phase conjugation of light fields as a result of nonlinear interaction in saturable media

Е. В. Ивакин, V. G. Koptev, Alexander M. Lazaruk, I. P. Petrovich, Alexander S. Rubanov

Published Nov 1, 1979• 2 citations
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Soviet Journal of Quantum Electronics•Sep 30, 1990•4 citations
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).
Vectorial phase conjugation (VPC) is an effective way of eliminating both phase and polarisation distortions in optical systems and is of special interest in solid-state amplifiers operating at high average powers in which the amplified radiation can become depolarised. There have been experimental demonstrations of VPC in two-photon resonant media and in media with local response [1,2]. This paper presents experimental results of the phase conjugate reflectivity and fidelity of VPC in saturable media (Cr4+:YAG and inverted Nd3+:YAG).
An analysis is made of double phase conjugation in media with a local response. A threshold is found for the generation of a phase-conjugated wave by the double process in a medium with a local response and with additional amplification. An analysis is made of the further possibilities of generation of phase-conjugated radiation in the case of a four-wave interaction characterized by a feedback loop established when double phase conjugation takes place in a nonlinear medium. The threshold intensity of the input radiation ensures possible generation of a phase-conjugated wave as a result of a four-wave interaction characterized by a feedback loop and merging of counterpropagating beams in a nonlinear medium.