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Soviet Journal of Quantum Electronics

Dynamics of reflection of signal pulses from a thermal self-pumped four-wave mirror

A. S. Dement'ev, K Yu Kishkis

Published Mar 31, 1992• 0 citations
Publisher

Abstract

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.

DOI
10.1070/qe1992v022n03abeh003396

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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.
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A transient model of degenerate four-wave mixing in saturable amplifiers is developed for calculation of the phase-conjugate reflectivity in the weak-probe-beam limit. Our model takes into account the laser amplification of all the interacting beams together with the wave-mixing process between the two counterpropagating pump waves. Experimental investigations are made in a flash-lamp-pumped Nd:YAG amplifier with nanosecond pulses at 1.06 microm. A reflectivity of 22% is achieved when all the waves interfere within the laser medium.
We have studied both experimentally and numerically the role of resonant refractive index gratings in a self-pumped phase conjugate mirror based on an Nd:YAG amplifier with nonreciprocal feedback loop. In experiment the generation of the phase-conjugating laser was delayed with respect to recording of a holographic nonlinear mirror by an external beam. An increase in the phase-conjugate reflectivity at a delay time of about 3 microseconds was measured. The numerical calculation confirmed the additional contribution of the resonant refractive-index grating, which is formed in the pumped Nd:YAG crystal due to excitation of a higher-lying level of Nd3+ ions, to efficiency of phase conjugation.
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The effect of self-pumped phase conjugation (SPPC) of the light beam in the inverted laser crystal (LC) with the feedback loop was investigated in recent years. The possibility of SPPC in the reciprocal loop scheme is concerned with the refractive index grating which occurs due to difference of polarizability of the Nd ions in the metastable and the ground states [1]. The high efficiency of multipass geometry in the phase conjugation systems based on the laser crystals have been demonstrated for the degenerate four-wave mixing processes [2].
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