Scaling of bound and free-carrier contributions to the nonlinear refractive index in CdS0.75Se0.25, CdS, and ZnSe with femtosecond pulse excitation

E. C. Fox; E. J. Canto-Said; H. M. Driel

Quantum Electronics and Laser Science Conference
OSA Technical Digest (Optica Publishing Group, 1992),
paper QThD21

Scaling of bound and free-carrier contributions to the nonlinear refractive index in CdS_0.75Se_0.25, CdS, and ZnSe with femtosecond pulse excitation

E. C. Fox, E. J. Canto-Said, and H. M. Driel

Quantum Electronics and Laser Science Conference 1992

Anaheim, California United States
10–15 May 1992
ISBN: 1-55752-540-5

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QELS Poster Session 3 (QThD)

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E. C. Fox, E. J. Canto-Said, and H. M. Driel, "Scaling of bound and free-carrier contributions to the nonlinear refractive index in CdS0.75Se0.25, CdS, and ZnSe with femtosecond pulse excitation," in Quantum Electronics and Laser Science Conference, E. Ippen, S. Chu, J. Shah, and C. Weiman, eds., Vol. 13 of OSA Technical Digest (Optica Publishing Group, 1992), paper QThD21.

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Abstract

The relative influence of bound and photogenerated free carriers on refractive-index changes induced by subband-gap radiation is an important aspect in determining the limitations to all-optical switching. Here we report results of a comprehensive study of femtosecond time-resolved refractive index changes in the wideband-gap II–VI semiconductors ZnSe, CdS, arid CdS_0.75Se_0.25. The II-VI materials are of interest because of their large optical nonlinearities and the recent development of blue-green lasers. The optical source is an amplified colliding-pulse mode- locked (CPM) laser that generates 100-fs pulses at 620 nm and 20 Hz with energies up to 100 µJ.

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