Temperature-dependent optical rotatory power in the presence of birefringence of KTA and KTP crystals by the high-accuracy universal polarimeter method at 632.8 nm wavelength

• Published in: Journal of applied crystallography 2014-04, Vol.47 (2), p.566-574
• Main Authors: Hernández-Rodríguez, C., Fragoso-López, A. B., Herreros-Cedrés, J., Guerrero-Lemus, R.
• Format: Article
• Language: English
• Subjects: birefringence; optical rotatory power; orthorhombic crystals
• ISSN: 1600-5767; 1600-5767
• DOI: 10.1107/S1600576714000454

Temperature‐dependent simultaneous measurement of birefringence and optical rotatory power (ORP) for orthorhombic crystals of potassium titanyl phosphate (KTP) and potassium titanyl arsenate (KTA) has been achieved by using the high‐accuracy universal polarimeter method at 632.8 nm wavelength. The birefringence and ORP changes along the (110) planes for KTA and KTP crystals were found to have a nearly parabolic form for the temperature range 297–493 K. The thermal variation coefficients were found to be 0.9 (5) × 10−5 K−1 and 5.6 (3) × 10−8 K−2 for KTA and 0.9 (5) × 10−5 K−1 and 5.7 (3) × 10−8 K−2 for KTP. The ORPs at 297 K were found to be 20.0 (20) and 20.5 (15)° mm−1 for KTA and KTP, respectively. The thermal variation coefficients of the ORP were found to be 1.8 (2) × 10−3° mm−1 K−1 and 1.1 (1) × 10–5° mm−1 K−2 for KTA and 1.9 (2) × 10−3° mm−1 K−1 and 1.2 (1) × 10−5° mm−1 K−2 for KTP.