6533b86cfe1ef96bd12c8aae

RESEARCH PRODUCT

Light-induced transmission nonlinearities in gallium selenide

J. BouvierMiguel V. AndrésCh. Ferrer-rocaAlfredo SeguraV. Muñoz

subject

Absorption coefficientsNonlinear opticsExcitonRefractive indexGeneral Physics and AstronomyIII-VI semiconductorsGallium compounds ; III-VI semiconductors ; Nonlinear optics ; Light transmission ; Refractive index ; Excitons ; Absorption coefficients ; Carrier densitylaw.inventionOpticslaw:FÍSICA [UNESCO]TransmittancePulse (signal processing)business.industryChemistryGallium compoundsUNESCO::FÍSICANonlinear opticsLaserIntensity (physics)Attenuation coefficientLight transmissionOptoelectronicsExcitonsCarrier densitybusinessRefractive index

description

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. Chantal.Ferrer@uv.es ; Jaqueline.Bouvier@uv.es ; Miguel.Andres@uv.es ; Vicente.Munoz@uv.es

10.1063/1.369748http://hdl.handle.net/10550/12855