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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Phase conjugation of orthogonal polarized laser beams in inverted Nd:YAG-rod

Oleg L. Antipov, Sergey I. Belyaev, A.S. Kuzhelev

Published Jan 1, 1994• 0 citations
Publisher

Abstract

It is well known that inverted laser crystals have a strong inertial optical nonlinearity that is connected with changing of susceptibility by saturation of laser transition. The phase conjugation (PC) of laser beams by parametric oscillation in resonator with holographic mirror induced by means of mutually-coherent pumping waves in an inverted laser crystal was discussed.1,2 In our work, the phase conjugation of laser beams in loop scheme with an inverted Nd:YAG-rod (where two near-counter-running light beams with orthogonal polarization intersected) was investigated.

DOI
10.1364/cleo_europe.1994.cmh1

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 2, 2001•0 citations
It is well known that inverted laser crystals have a strong inertial optical nonlinearity that is connected with changing of susceptibility by saturation of laser transition. The phase conjugation (PC) of laser beams by parametric oscillation in resonator with holographic mirror induced by means of mutually-coherent pumping waves in an inverted laser crystal was discussed.1,2 In our work, the phase conjugation of laser beams in loop scheme with an inverted Nd:YAG-rod (where two near-counter-running light beams with orthogonal polarization intersected) was investigated.
Self-pumped phase conjugation of the light beam in an inverted Nd:YAG-crystal with the different schemes of the feedback loop has been studied experimentally and theoretically. The quality of the phase conjugation of space heterogeneous beam, and the vibrational resistance for different polarizations of the input beam were investigated. The thresholds of parametric generation of the phase conjugated beam in the inverted media with real and imaginary parts of the nonlinear susceptibility are discussed.
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].
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.