Light-induced transmission nonlinearities in gallium selenide
نویسندگان
چکیده
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. © 1999 American Institute of Physics. @S0021-8979~99!05707-2#
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