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Optics Communications

Collision-assisted optical field induced circular birefringence in sodium vapor

Qihuang Gong, Y. H. Zou

Published May 1, 1988• 4 citations
Publisher
DOI
10.1016/0030-4018(88)90417-8

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Degenerate four-wave mixing in dense sodium vapor under conditions of strong pressure-induced Zeeman pumping is investigated. Thermal diffusion and its interplay with the Zeeman light shift are found to be responsible for the generation of a grating mechanism that is not sensitive to thermal washout. The effect can be observed experimentally after eliminating the influence of radiation trapping by the use of nitrogen as a buffer gas. Under these conditions large nonlinearities are produced which also influence the propagation of the signal wave via collision-aided circular birefringence.