Japanese Journal of Applied Physics

Nonlinear optical coefficient of alas thin film on gaas substrate

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We report the first measurement of the nonlinear optical coefficient, d14, at the fundamental wavelength of 1.06 µm, of AlAs grown by molecular beam epitaxy. The d coefficient is deduced from the intensities of second-harmonic waves reflected from an AlAs film grown on GaAs. Multiple reflections in the film and second-harmonic generation in the substrate are taken into account. The ratio d14(AlAs)/d14(GaAs) is found to be 0.23±0.06. © 1992 The Japan Society of Applied Physics.