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 ethylenediammonium 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 EDSxSe1-x. A scheme for using mixed crystals with isotropic points as tunable birefringent optical bandpass filters is proposed and their performance is modeled.
- Mueller matrix
- isotropic point
- mixed crystals
- optical activity
- single-crystal X-ray diffraction
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)