Determination of quadratic nonlinear optical coefficient of AlxGa1−xAs system by the method of reflected second harmonics

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Abstract
The quadratic nonlinear optical coefficient in the AlGaAs system has been systematically measured as a function of the alloy composition at the fundamental wavelength of 1.064 μm by the method of reflected harmonics. The harmonic waves from the thin‐film samples are analyzed considering various interferences including multiple reflections. The experimental results show a reduction of the magnitude of the second‐harmonic coefficient with increasing Al content in the AlGaAs system. This tendency is consistent with Miller’s rule.