Tuning the optical isotropic point of mixed crystals of ethylenediammonium sulfate/selenate

Melissa Tan, Alexander T. Martin, Alexander G. Shtukenberg, Bart Kahr

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)51-57
Number of pages7
JournalJournal of Applied Crystallography
Issue numberPt 1
StatePublished - Feb 1 2020


  • Mueller matrix
  • isotropic point
  • mixed crystals
  • optical activity
  • selenates
  • single-crystal X-ray diffraction

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


Dive into the research topics of 'Tuning the optical isotropic point of mixed crystals of ethylenediammonium sulfate/selenate'. Together they form a unique fingerprint.

Cite this