Tan Melissa, Martin Alexander T, Shtukenberg Alexander G, Kahr Bart
Department of Chemistry, New York University, New York, NY 10003, USA.
J Appl Crystallogr. 2020 Feb 1;53(Pt 1):51-57. doi: 10.1107/S1600576719015863.
In anisotropic crystals, optical isotropic points are wavelengths where linear birefringence disappears because the refractive indices for both eigenmodes are accidentally equivalent. Here, the optical isotropic point of ethylene-diammonium selenate (EDSe) is tuned by generating a solid-solution series of EDSe doped with sulfate. Mueller matrix polarimetry and single-crystal X-ray diffraction are used to correlate changes in linear birefringence with the crystal composition of EDS Se . A scheme for using mixed crystals with isotropic points as tunable birefringent optical bandpass filters is proposed and their performance is modeled.
在各向异性晶体中，光学各向同性点是指线性双折射消失的波长，因为两种本征模的折射率偶然相等。在此，通过生成掺杂硫酸盐的硒酸乙二铵（EDSe）固溶体系列来调节硒酸乙二铵（EDSe）的光学各向同性点。利用穆勒矩阵偏振测量法和单晶X射线衍射将线性双折射的变化与EDS Se的晶体组成相关联。提出了一种使用具有各向同性点的混合晶体作为可调谐双折射光学带通滤波器的方案，并对其性能进行了建模。
