We analyse the functional capabilities of new crystals, BaGa 2 GeS 6 (BGGS) and BaGa 2 GeSe 6 (BGGSe), which are used for nonlinear optical frequency conversion in their transparency range. The wavelengths at which maximum conversion efficiencies can be obtained and the tuning range for difference-frequency generation are found. It is shown that there are wavelength combinations at which the effective nonlinearity coefficient varies only slightly in a wide frequency band.

中文翻译：

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用于非线性光学频率转换的BaGa 2 GeS 6和BaGa 2 GeSe 6晶体

我们分析了新晶体BaGa 2 GeS 6（BGGS）和BaGa 2 GeSe 6（BGGSe）的功能，这些晶体在其透明范围内用于非线性光学频率转换。找到可以获得最大转换效率的波长，并找到用于产生差频的调谐范围。结果表明，存在一些波长组合，在这些波长组合中，有效非线性系数在很宽的频带中仅略有变化。