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Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics

Phase conjugation in critical microemulsions

E. Freysz, Éric Laffon, Jean-Pierre DELVILLE, A. Ducasse

Published Mar 1, 1994• 20 citations
Publisher

Abstract

We present a model to describe degenerate four-wave mixing in critical binary liquid mixtures and we analyze it through an experimental study of phase conjugation in critical microemulsions. The two concentration gratings related to the four-wave-mixing configuration give contributions to the conjugated signal which can be separated from their different formation and relaxation times. The model quantitatively describes the amplitude and the dynamics of the gratings and thus of the conjugate signal when one approaches the critical point. The theoretical predictions fit very well with the experimental data. Close to the critical point a 10% reflectivity has been obtained in this medium using a beam power of 1 W from a cw ${\mathrm{Ar}}^{+}$ laser. The limitations of these reflectivities at higher powers are discussed.

DOI
10.1103/physreve.49.2141

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Abstract We present a study of optical phase conjugation through degenerate four-wave mixing in CuCl, as a function of light frequency, intensity, polarization and sample temperature. The phase-conjugate signal exhibits two maxima at the frequencies of the T5 exciton (one-photon resonance) and of the biexciton (two-photon resonance). By appropriate combinations of the input beam polarizations, it is possible to single out the various terms contributing to the signal (small-spaced, large-spaced population grating and two-photon coherent excitation). The absolute value of X(3) responsible for the two-photon resonance has been determined ( x(3) (-w,w,w, -w) = 3.10-7 e.s.u.). It leads to ‘mirror’ efficiencies of the order of 10% for input pump intensities I0 » 105 W cm -2 and sample thickness d» 10-4 cm. At higher I0, a saturation of the reflection takes place. The variation of the conjugate beam with temperature has been studied in the range 15 K < T <70 K. Finally, the phase-conjugate nature of the signal has been verified by inserting an aberrator in the path of the input probe beam, and by checking the reconstruction of the reflected beam.