M. Sheik-Bahae, D. J. Hagan, and E. W. Van Stryland
Using the "Z-scan" technique, which can separately and accurately measure nonlinear absorption (NLA) and nonlinear refraction (NLR), two-photon absorption (2PA) and the bound electronic Kerr effect (n2) have been measured in a large number of inorganic solids. As a result of this large database and detailed characterization, a universal predictive capability for both the NLA and NLR of solids has been developed over a range of band-gaps from 0.2 to 10 eV. It is found that n2 displays strong dispersion and sign reversal as ћω approaches the band-gap energy Eg.
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