Light-induced transmission nonlinearities in gallium selenide

The intensity of a He–Ne laser (633 nm, 5 mW) transmitted by different GaSe samples is observed to change in correlation with a Nd-yttrium–aluminum–garnet laser pulse (532 nm, 7.8 ns, 3 mJ) which excites them. Such time response has been attributed to a nonlinear optical effect, i.e., a decrease in...

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Bibliographic Details
Published in:Journal of applied physics 1999-04, Vol.85 (7), p.3780-3785
Main Authors: Ferrer-Roca, Ch, Bouvier, J., Segura, A., Andrés, M. V., Muñoz, V.
Format: Article
Language:English
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Summary:The intensity of a He–Ne laser (633 nm, 5 mW) transmitted by different GaSe samples is observed to change in correlation with a Nd-yttrium–aluminum–garnet laser pulse (532 nm, 7.8 ns, 3 mJ) which excites them. Such time response has been attributed to a nonlinear optical effect, i.e., a decrease in the refractive index due to the exciton screening by the photogenerated carriers. A calculation of the absorption coefficient and refractive index at different carrier concentrations has led to a reconstruction of transmittance transients which fully agree with the experimental data at different incident intensities and temperatures.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.369748