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Annual Meeting Optical Society of America

Transient beam combination with circularly polarized radiation

Tracy E. Dutton, Peter M. Rentzepis, Daniel N. Rogovin, T. P. Shen, J. Scholl

Published Jan 1, 1991• 0 citations
Publisher

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.

DOI
10.1364/oam.1991.wq7

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Two-wave mixing, or coherent beam combination, is of considerable interest to the nonlinear optics and laser physics communities. One approach, of particular interest to this study, involves irradiating an optical Kerr media with two nondegenerate laser beams. The finite response time of the Kerr material ensures that any laser-induced grating will lag the interference pattern formed by the two nondegenerate laser beams and thereby allow energy transfer from the high-frequency beam to the low-frequency one. For such media, thermal light scattering fluctuations give rise to thermal noise gratings which can transfer energy from one wave to the other. Since such gratings are random in nature, their effect is to introduce fluctuations in the two-wave mixing process itself. We examine the influence of such thermal noise gratings on two-wave mixing and determine the SNR for this process in the nondepleted pump approximation.