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Soviet Journal of Quantum Electronics

Spatial polarization wavefront reversal under conditions of four-wave mixing in biochrome films

Elena Y. Korchemskaya, M. S. Soskin, V. B. Taranenko

Published Apr 30, 1987• 27 citations
Publisher

Abstract

Theoretical and experimental investigations were made of the polarization properties of a reversed wave created as a result of four-wave mixing in an isotropic medium with an anisotropic nonlinearity. New conditions were found for complete spatial polarization wavefront reversal which were realized using an anisotropic nonlinearity of biochrome films based on bacteriorhodopsin.

DOI
10.1070/qe1987v017n04abeh008192

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Space-polarization phase conjugation upon four-wave mixing in biochrome films

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Soviet Journal of Quantum Electronics•Apr 1, 1987•0 citations
Theoretical and experimental investigations were made of the polarization properties of a reversed wave created as a result of four-wave mixing in an isotropic medium with an anisotropic nonlinearity. New conditions were found for complete spatial polarization wavefront reversal which were realized using an anisotropic nonlinearity of biochrome films based on bacteriorhodopsin.
A method of polarization (vector) wavefront reversal by four-wave mixing in a photoanisotropic material is described. Jones matrices, describing the dynamic holographic gratings recorded in the material at arbitrary polarization of the signal wave, are derived. They are employed to define the conditions for generating a wave that is fully conjugate (by polarization as well) to the signal wave. The way to achieving these conditions by optically controlling the anisotropy of the nonlinear medium is demonstrated experimentally.
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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.
A theoretical study is made of the possibility of reversal of the wavefront of a light beam in respect of the phase and polarization by degenerate four-wave interactions in photorefractive ferroelectric crystals. It is shown that the polarizations of the signal and reversed waves can be conjugate only under certain conditions which must be satisfied by the intensity, phase, and polarization of the pump beams, and also by the orientation of the optic axis of a crystal. Specific situations when these conditions are satisfied are considered in the case of photorefractive ferroelectric crystals of the 3m and 4mm symmetries.