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Journal of Russian Laser Research

Effective method of phase conjugation of multifrequency radiation in ?pseudo?-four-wave interaction

N. E. Vtorova, А. А. Степанов, Vladimir A. Shcheglov

Published Jan 1, 1990• 0 citations
Publisher
DOI
10.1007/bf01125228

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Theoretical and experimental investigations were made of a four-wave interaction of middle-infrared radiation based on a thermal nonlinearity of absorbing liquids and gases. A study was made of the influence of parasitic effects associated with heating of a nonlinear medium (such as the thermal lens effect, frequency sweeping of interacting waves, thermal expansion of the medium, and convection) on the efficiency of the four-wave interaction and the quality of phase conjugation utilizing this interaction. The conditions under which this influence is minimal were identified. An experimental study was made of phase conjugation of CO 2 laser radiation by a four-wave interaction in CCl 4 with a high reflection coefficient (up to 20% in the cw regime). The attained phase conjugation was limited the thermal lens effect, but this could be compensated.
It is shown that, under conditions typical of the active medium of a continuous-flow CO laser, large-scale gain gratings play the main role in a phase-conjugation system based on degenerate four-wave mixing. The multifrequency nature of the emission spectrum of a CO laser increases the depth of modulation of the amplitude gratings as a result of two principal mechanisms: the dependence of the rate of relaxation of the function describing the distribution of molecules between vibrational levels on the number of such levels, when this function is disturbed; and the mutual influence of the emission and amplification processes involving adjacent vibrational transitions.