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Scaling of four-photon absorption in InAs

M. P. Hasselbeck, E. W. Van Stryland, and M. Sheik-Bahae

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Abstract

By monitoring the nonlinear absorption of picosecond laser pulses as a function of lattice temperature, we identify four-photon absorption in bulk InAs. Optical bandgap scaling of this process is consistent with a calculation obtained from fourth-order perturbation theory for allowed–allowed–allowed–forbidden transitions. A model of nonlinear absorption based on laser-induced impact ionization disagrees with the experimental results.

© 1997 Optical Society of America

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