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Soviet Journal of Quantum Electronics

Reflection of a multifrequency signal in four-wave interaction in germanium at 10.6μ

Nicolai G. Basov, Boris Ya Zel'dovich, Valeri I. Kovalev, F S Faĭzullov, V. B. Fedorov

Published Apr 30, 1981• 4 citations
Publisher

Abstract

An investigation is made of the reflection of a mulitfrequency signal in connection with wavefront reversal in four-wave interaction. When the signal and reference waves are generated by a single source and their optical paths are matched, it has been established experimentally and theoretically that if the length of the medium is greater than the coherence length, the reflection efficiency is the same as that for monochromatic waves of the same intensity. For a short medium, fluctuations of the intensity of many nonphase-matched spectral components should increase the reflection efficiency up to sixfold.

DOI
10.1070/qe1981v011n04abeh006871

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Soviet Journal of Quantum Electronics•Oct 31, 1986•3 citations
An investigation is made of the reflection of a mulitfrequency signal in connection with wavefront reversal in four-wave interaction. When the signal and reference waves are generated by a single source and their optical paths are matched, it has been established experimentally and theoretically that if the length of the medium is greater than the coherence length, the reflection efficiency is the same as that for monochromatic waves of the same intensity. For a short medium, fluctuations of the intensity of many nonphase-matched spectral components should increase the reflection efficiency up to sixfold.
A simple optical polarization isolator (OPI) was developed for wavefront reversal systems operating at 10.6 μ . Its decoupling efficiency was up to 16 dB. An experimental investigation was made of the influence of the change in the polarization state of the second reference wave introduced by the OPI on the reflection efficiency under conditions of a four-wave interaction in InAs and SF 6 . Partial dispersal of the grating recorded by the signal and opposite reference waves was due to the diffusion of free electrons in InAs.
An analysis is made of the theory of four-wave wavefront reversal allowing for linear absorption and reflection of all the interacting waves from a mirror which forms a second reference wave from the first incident wave. The Born approximation is used to find the optimum thickness of the nonlinear medium giving the maximum reversal coefficient. Conditions for parametric four-wave oscillation with an arbitrary frequency shift are determined and the dependence of the threshold intensity of the incident reference wave on the linear reflection coefficient of the wave-forming mirror is found for a given thickness of the medium in the absence of absorption.
A theoretical analysis is made of the efficiency of wavefront reversal under conditions of a degenerate form of the four-wave interaction in a resonantly absorbing (amplifying) medium allowing for changes in the pump waves as a result of their natural resonant absorption (amplification). The coefficient of reflection into a reversed wave is obtained as a function of the optical thickness of a layer of the medium, the boundary values of the pump wave intensity, and the shift of the field frequency from the line center. The optimal values of these parameters and the corresponding maximum reflection coefficient are determined.