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Experimental and theoretical determination of the optical rotation in langasite family crystals

机译：硅酸镧系晶体旋光性的实验和理论测定

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摘要

Optical properties of 21 langasite family crystals of different compositions have been studied. Dispersion dependences of the specific optical rotation for light propagation along the optical axis are experimentally obtained for La3Ta0.25Ga5.25Si0.5O14, La3Ta0.25Zr0.5Ga5.25O14, and La3Zr0.5Ga5Si0.5O14 crystals. Based on the known refractive indices of six crystals, the refractive indices for 15 crystals are calculated by the method of molecular refraction. Based on the experimental data, the dependence of the specific optical rotation for light propagation along the optical axis on the birefringence is plotted for 10 crystals. Using this dependence, the specific optical rotation is estimated for 11 more crystals of different compositions. Based on X-ray diffraction data, the specific optical rotation is calculated by the WinOptAct program for 13 crystals. The application of different methods makes it possible to predict the optical characteristics of langasite family crystals of different compositions.
机译：研究了21种不同组成的硅酸镧系晶体的光学性质。对于La3Ta0.25Ga5.25Si0.5O14，La3Ta0.25Zr0.5Ga5.25O14和La3Zr0.5Ga5Si0.5O14晶体，实验获得了特定旋光度沿光轴传播的色散依赖性。基于六种晶体的已知折射率，通过分子折射法计算出十五种晶体的折射率。根据实验数据，针对10个晶体绘制了沿光轴传播的光的特定旋光度与双折射的关系。利用这种依赖性，可以估算出另外11种不同组成的晶体的比旋光度。根据X射线衍射数据，由WinOptAct程序计算出13个晶体的比旋光度。不同方法的应用使得可以预测不同组成的硅酸镁族晶体的光学特性。

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