Ab initiocalculations of two-photon absorption spectra in semiconductors

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Abstract
Degenerate and nondegenerate two-photon absorption spectra and their anisotropy are evaluated for various semiconductors, by using ab initio full-band-structure and microscopic-nonlinear-susceptibility calculations. It is shown that most semiconductors have abundant spectral structures originating from the critical-point transitions similar to one-photon absorption. The calculated spectra are in good agreement with recent accurate experimental results, demonstrating the usefulness of ab initio approach in the two-photon-absorption calculations.