1 November 1990 Relation between N2 and two-photon absorption
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We present evidence from nonlinear refractive index measurements, two-photon absorption measurements, and four- wave mixing measurements on semiconductors showing that the bound electronic nonlinearity can be calculated from two-photon absorption dispersion via a simple Kramers-Kronig analysis. This analysis shows n2 changing from positive to negative as the photon energy approaches the band-gap energy, consistent with observations. Additionally, this simple calculation, which assumes two parabolic bands, gives good agreement with measured values of n2 in wide- gap dielectrics that are 2 to 3 orders of magnitude smaller than in semiconductors.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Sheik-Bahae, M. Sheik-Bahae, } "Relation between N2 and two-photon absorption", Proc. SPIE 1438, Laser-Induced Damage in Optical Materials 1989, 14381L (1 November 1990); doi: 10.1117/12.2294466; https://doi.org/10.1117/12.2294466

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