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Soviet Journal of Quantum Electronics

Wavefront reversal in a population-inverted carbon dioxide gas caused by light-induced heating

Л А Васильев, Michail G. Galushkin, Aleksandr M Seregin, Nikolay V. Cheburkin

Published Jun 30, 1982• 7 citations
Publisher

Abstract

It is shown that light-induced evolution of heat in thermodynamically nonequilibrium media may result in wavefront reversal in degenerate four-wave interaction. The main parameters of this process are calculated and the conditions are found under which its efficiency is greater than of the wavefront reversal due to nonlinearity of the gain.

DOI
10.1070/qe1982v012n06abeh005211

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It is shown that light-induced evolution of heat in thermodynamically nonequilibrium media may result in wavefront reversal in degenerate four-wave interaction. The main parameters of this process are calculated and the conditions are found under which its efficiency is greater than of the wavefront reversal due to nonlinearity of the gain.
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A wavefront reversal system is proposed for high-power optical radiation. This system is based on a resonant four-wave interaction without recourse to external pump waves. Stimulated scattering of the wave being reversed in a resonant medium placed inside a resonator creates two opposite pump waves and a parametric interaction between them generates reversed radiation. The efficiency of such self-reversal is comparable with the efficiency of conventional wavefront reversal as a result of a four-wave interaction in nonresonant media with a phase nonlinearity and it may reach 10 −3 .
A theoretical analysis is made of wavefront reversal which is not sensitive to the optical quality of the nonlinear wavefront-reversing medium when complex-conjugate reference waves are formed spontaneously. An investigation is made of the linear and nonlinear stages of reversed wave generation in various nonlinear media using feedback in degenerate and nondegenerate four-wave interaction. It is shown that in nonamplifying nonlinear media this method can only be achieved by additional amplification of the radiation reflected from the nonlinear medium.
Equations describing a transient degenerate four-wave interaction in a resonant medium are derived and solved numerically. The approximation of a "following" nonlinear polarization state is used to determine the range of values of the parameters of the medium and the radiation field in which the efficiency of a transient four-wave interaction is higher than that of the steady-state process. It is found that amplification of weak radiation as a result of transient energy exchange can only be achieved in the four-wave interaction for different pump wave intensities.