SEDL / STP / STP1117-EB / STP26525S

Relation Between n² and Two-Photon Absorption

Sheik-Bahae, M
University of Central Florida, Orlando, FL

Hagan, DJ
University of Central Florida, Orlando, FL

Van Stryland, EW
University of Central Florida, Orlando, FL

Wei, TH
University of Central Florida, Orlando, FL

Said, AA
University of Central Florida, Orlando, FL

Canto, E
University of Central Florida, Orlando, FL

Miller, A
University of Central Florida, Orlando, FL

Pages: 7    Published: Jan 1990

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Abstract

We present evidence from nonlinear refractive index measurements, two-photon absorption measurements, and fourwave 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.