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Soviet Journal of Quantum Electronics

Use of degenerate parametric processes for wavefront correction (review)

É S Voronin, Vera M. Petnikova, В. А. Шувалов

Published May 31, 1981• 10 citations
Publisher

Abstract

A review is given of results obtained by the present authors in investigations of wavefront reversal in degenerate parametric processes. An analysis is made of the problem of transmission of signal radiation along an optically inhomogeneous path. A model of a system to compensate for phase distortions using wavefront reversal in parametric processes is developed. The mathematical device of the spread function is used to determine the limiting capabilities of the method. It is found that satisfactory compensation for distortions is achieved when a parametric radiation converter resolves the effective scale of the inhomogeneities. The possibilities for implementing these systems in practice are discussed.

DOI
10.1070/qe1981v011n05abeh006899

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A review is given of results obtained by the present authors in investigations of wavefront reversal in degenerate parametric processes. An analysis is made of the problem of transmission of signal radiation along an optically inhomogeneous path. A model of a system to compensate for phase distortions using wavefront reversal in parametric processes is developed. The mathematical device of the spread function is used to determine the limiting capabilities of the method. It is found that satisfactory compensation for distortions is achieved when a parametric radiation converter resolves the effective scale of the inhomogeneities. The possibilities for implementing these systems in practice are discussed.
An investigation was made of the quality of reconstruction of the signal wavefront in a single-pass system for compensation of phase distortions accompanied by frequency up-conversion. It was found that the best resolution and contrast were achieved when the reconstructed field was observed in the optimal focusing plane and the image of an inhomogeneous medium was transferred to the center of a nonlinear converter. The efficiency of the parametric process was enhanced by two-photon excitation of the 3 s –4 s transition in sodium vapor. The converter resolution was 13 lines/mm. The dependence of the contrast in the reconstructed field on the parameters of the compensation system was determined.
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.