Abstract

Spectral dependence of the third-order optical nonlinearity in a bulk crystal of GaSe is studied at room temperature. The experimental techniques involved are nonlinear transmission and laser-induced self-diffraction. A theory of self-diffraction, which for the first time takes into account the multiple-beam interferences, is developed. The measurements are carried out in the spectral range around the excitonic transition of GaSe. The refractive-index changes resulting from electron–hole plasma effect contribute to the generation of a phase grating below the band gap.

© 1997 Optical Society of America

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