Title :
Dispersion of bound electron nonlinear refraction in solids
Author :
Sheik-Bahae, Mansoor ; Hutchings, David Crichton ; Hagan, David J. ; Van Stryland, Eric W.
Author_Institution :
Center for Res. in Electro-Opt. & Lasers, Univ. of Central Florida, Orlando, FL, USA
fDate :
6/1/1991 12:00:00 AM
Abstract :
A two-hand model is used to calculate the scaling and spectrum of the nondegenerate nonlinear absorption. From this, the bound electronic nonlinear refractive index n2 is obtained using a Kramers-Kronig transformation. The authors include the effects of two-photon and Raman transitions and the AC Stark shift (virtual band blocking). The theoretical calculation for n2 shows excellent agreement with measured values for a five-order-of-magnitude variation in the modulus of n2 in semiconductors and wide-gap optical solids. Beam distortion methods were used to measure n2 in semiconductors. The observations result in a comprehensive theory that allows a prediction of n2 at wavelengths beneath the band edge, given only the bandgap energy and the linear index of refraction. Some consequences for all-optical switching are discussed, and a wavelength criterion for the observation of switching is derived
Keywords :
Kramers-Kronig relations; nonlinear optics; optical dispersion; refractive index; semiconductors; AC Stark shift; Kramers-Kronig transformation; Raman transitions; all-optical switching; band edge; bandgap energy; bound electronic nonlinear refractive index; nondegenerate nonlinear absorption; scaling; semiconductors; spectrum; theoretical calculation; two-hand model; two-photon transitions; virtual band blocking; wide-gap optical solids; Absorption; Distortion measurement; Electrons; Nonlinear distortion; Nonlinear optics; Optical distortion; Optical refraction; Optical variables control; Refractive index; Solids;
Journal_Title :
Quantum Electronics, IEEE Journal of
