Femtosecond time-resolved refractive index changes in CdSSe

Eric C. Fox; Edesly J. Canto-Said; Henry M. van Driel

doi:10.1117/12.137682

21 October 1992 Femtosecond time-resolved refractive index changes in CdSSe

Eric C. Fox, Edesly J. Canto-Said, Henry M. van Driel

Proceedings Volume 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors; (1992) https://doi.org/10.1117/12.137682
Event: Semiconductors '92, 1992, Somerset, NJ, United States

Abstract

Light deflection and diffraction scattering techniques have been used in pump-probe geometries to measure the temporal and irradiance dependences of refractive index changes induced by intense 120 fsec (lambda) equals 620 nm pulses in 100 micrometers thick crystals of bulk CdS and CdS_0.75Se_0.25 at 295 K. Instantaneous and long lived negative refractive index changes are observed. The instantaneous changes are attributed to optical Stark and two- photon resonance effects while the long lived changes are attributed to free carrier bandfilling effects. The irradiance dependences of the different contributions are discussed in terms of a model in which attenuation is dominated by two-photon absorption. The rise and decay times associated with the bandfilling nonlinearity have allowed us to identify a carrier cooling time of 2 psec, and a carrier lifetime which can be as short as 6 psec for pump irradiances in excess of 300 GW/cm². Possible mechanisms for the carrier recombination are discussed.

Citation Download Citation

Eric C. Fox, Edesly J. Canto-Said, and Henry M. van Driel "Femtosecond time-resolved refractive index changes in CdSSe", Proc. SPIE 1677, Ultrafast Lasers Probe Phenomena in Semiconductors and Superconductors, (21 October 1992); https://doi.org/10.1117/12.137682

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