Abstract

We report the wavelength dependencies of the two- and three-photon absorption coefficients of undoped GaAs in the spectral range $1.3–3.5\mu \mathrm{m}$, as well as nonlinear refractive index $n_2$ in the range $1.7–3.25\mu \mathrm{m}$. The data were obtained by using the single-beam Z-scan method with $100\text{-}\mathrm{fs}$-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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