SYMPOSIA PAPER Published: 01 January 1990

Relation Between n and Two-Photon Absorption


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.

Author Information

Sheik-Bahae, M
Hagan, DJ
Van Stryland, EW
Wei, TH
Said, AA
Canto, E
Miller, A
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Developed by Committee: E13
Pages: 591–597
DOI: 10.1520/STP26525S
ISBN-EB: 978-0-8031-5157-4
ISBN-13: 978-0-8031-4478-1