Abstract
Single-wavelength measurements of the two-photon absorption coefficient of large-gap semiconductors have been widely reported.1 It has been shown recently that a knowledge of β(ω1, ω2) at all frequencies ω2 enables one to calculate, by means of a Kramers-Kronig transformation, the bound-electronic nonlinear index of refraction n2(ω1)2. Additionally, a scaling rule for the nondegeiterate two-photon absorption coefficient was derived in by Sheik-Bahae et al.2 which implies that all semiconductors will behave similarly under subresonant excitation. Hero, we report a broad-band investigation of the two-photon absorption spectrum of three II-VI semiconductors and comparison of the results with theory.
© 1992 Optical Society of America
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