Abstract
We report the wavelength dependencies of the two- and three-photon absorption coefficients of undoped GaAs in the spectral range , as well as nonlinear refractive index in the range . The data were obtained by using the single-beam Z-scan method with -long optical pulses. Anisotropy of the three-photon absorption coefficient was observed and found to be consistent with the crystal symmetry of GaAs.
© 2007 Optical Society of America
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