We report the first measurements of phase-matching angles for second-harmonic generation, sum- and difference- frequency generations performed over the transparency range of the uniaxial α-GeO₂ crystal. A simultaneous fit of these data provided dispersion equations. The optical damage threshold and the magnitude of the nonlinear coefficient d₁₁ are also determined. We found |$d_{11}^{GeO2}({0.67\;{\rm{\mu m}}} )|= 0.76\; \pm 0.09\;$ pm/V.

中文翻译：

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压电晶体α-GeO2的线性和非线性光学特性

我们报告了在单轴 α-GeO ₂晶体的透明度范围内执行的二次谐波生成、和频和差频生成的相位匹配角的第一次测量。这些数据的同时拟合提供了色散方程。还确定了光学损伤阈值和非线性系数 d ₁₁的大小。我们发现 | $d_{11}^{GeO2}({0.67\;{\rm{\mu m}}}​​ )|= 0.76\; \pm 0.09\;$ pm/V。