Multiphoton absorption and nonlinear refraction of GaAs in the mid-infrared |
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Authors: | Hurlbut W C Lee Yun-Shik Vodopyanov K L Kuo P S Fejer M M |
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Institution: | Department of Physics, Oregon State University, Corvallis 97331-6507, USA. |
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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 microm, as well as nonlinear refractive index n2 in the range 1.7-3.25 microm. The data were obtained by using the single-beam Z-scan method with 100-fs-long optical pulses. Anisotropy of the three-photon absorption coefficient was observed and found to be consistent with the crystal symmetry of GaAs. |
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