Measurement of the second-harmonic-generation nonlinear susceptibilities of Se, CdTe, and InSb at 28.0 μm by comparison with Te

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Abstract
The magnitudes of the nonlinear optical susceptibilities of trigonal selenium, cadmium telluride, and indium antimonide have been measured at 28.0 μm relative to d11 (tellurium). By comparison to the recently measured absolute value for tellurium, d11(Te)=(5.7±1.6×10−10 m/V, the values obtained in this work are d11(Se)=(18.4±8.6)×10−10 m/V, d14 (CdTe)=(5.9±2.4)×10−11 m/V, and d14(InSb)=(5.6±2.3)×10−10 m/V. For Te, CdTe, and InSb, the measured 28.0 μm value is less than the 10.6 μm value, while for Se, the 28.0 μm value is considerably larger than the 10.6 value. These seemingly inconsistent results are explained using Garrett's anharmonic oscillator model.