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Third-Order Optical Nonlinearities In Semiconductors - The Two-Band Model, Claudio Aversa, J. E. Sipe, M. Sheik-Bahae, E. W. Van Stryland

Faculty Bibliography 1990s

We calculate the coherent electronic contributions to the third-order optical response χ(3)(-ω;ω,Ω,-Ω) of bulk semiconductors in the independent-particle approximation using a simple two-band model. The formalism used to derive this response coefficient naturally accounts for all relevant contributions and, in contrast to existing results in the literature, leads to physically realistic, nondivergent expressions in the limits ω,Ω→0. Such well behaved infrared limits imply that the imaginary part of our χ(3) correctly describes the dispersion of nondegenerate absorption; indeed for Ω=0 our results are consistent with predictions from Franz-Keldysh theory. Complementing these results, we can now also unambiguously extract from the …