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Transient beam combination with circularly polarized radiation

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Abstract

We examine coherent energy transfer between two circularly polarized degenerate Gaussian laser beams whose pulsewidth is of the order of the medium response time. For this situation, energy transfer proceeds via a phase lag that arises from the finite response time of the nonlinear medium and the pulsed nature of the incident light beams. Locally, this phase lag is driven by the difference in the local intensities of the two laser beams. Previously, we studied the gain as a function of beam delay for the case of a linearly polarized probe and a circularly pump wave, with a large pump to probe intensity radio. Here, we focus on the situation where the beam intensities are equal, both beams are circularly polarized, and CS2 is the nonlinear medium. This polarization configuration allows us to examine more closely the orientational gratings formed by the two light beams as they propagate through the sample.

© 1991 Optical Society of America

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