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Optics and Spectroscopy

Effect of saturation in phase conjugation in four-wave mixing of polarized light

G. G. Adonts, D G Akopyan

Published Jan 1, 1986• 0 citations
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We develop a semiclassical theory of phase conjugation by two-photon-resonant degenerate four-wave mixing. Our theory treats both the tensor nature of the interaction and the effects of saturation of the atomic system. Previous theories that include saturation effects have treated only the scalar case,1 while theories that include polarization properties have treated the problem only in lowest-order perturbation theory.2 We consider an S → S two-photon transition. This interaction is of Interest because it has been predicted theoretically2 and shown experimentally3 that in the limit of nonsaturating pump waves this interaction leads to the simultaneous conjugation of the wavefront and polarization of the incident probe wave (vector phase conjugation).
Rigidly held molecules display nonlinear optical properties which differ substantially from the properties of isotropic absorbers.1 In particular, the absorption of a collection of randomly oriented, rigidly held molecules saturates differently for different polarization states. We show that the polarization properties of degenerate four-wave mixing in such a medium are dramatically modified by this polarization-dependent saturation. We predict theoretically that for linearly polarized pump waves and for an input intensity near the saturation intensity, degenerate four-wave mixing in this material system can lead directly to vector phase conjugation; that is, to the simultaneous reversal of the optical wavefront and conjugation of the polarization state of the incident optical field.2 We confirm these theoretical predictions through phase conjugation experiments using fluorescein doped boric acid glass as the material system, and we find that degenerate four-wave mixing leads to nearly perfect vector phase conjugation when pumped by linearly polarized pump waves for field strengths near the saturation intensity.