We have obtained the polarization dependence of ultrafast nonlinear refraction by measuring the orientational dependence of self-phase modulation and cross-phase modulation in an Al0.18Ga0.82As waveguide at a frequency just beneath the two-photon absorption edge. It was found that nonlinear refraction exhibits a considerable anisotropy in accordance with theoretical calculations for GaAs. It was also found, as predicted, that perpendicular cross-phase modulation behaves differently from the isotropic Kleinmann result appropriate to silica fibers.
© 1995 Optical Society of America
Original Manuscript: January 17, 1995
Published: May 1, 1995
D. C. Hutchings, B. S. Wherrett, G. T. Kennedy, W. Sibbett, and J. S. Aitchison, "Polarization dependence of ultrafast nonlinear refraction in an AlGaAs waveguide at the half-band gap," Opt. Lett. 20, 991-993 (1995)