Abstract

Self-defocusing and nonlinear absorption resulting from two-photon-excited free charge carriers were observed in polycrystalline ZnSe at the low power density of ~ 30 MW/cm² by use of the Z-scan technique with nanosecond laser pulses. The total carrier absorption cross section and the variation of refractive index per unit of photoexcited carrier density were estimated to be 0.80 ± 0.10 × 10⁻¹⁸ cm² and 0.60 ± 0.15 × 10⁻²¹ cm³, respectively.

© 1994 Optical Society of America

Time-resolved Z-scan measurements of optical nonlinearities

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