A Study of Optical Uniformity of Lithium Niobate and Paratellurite Crystals by the Method of Conoscopy
A.I. Kolesnikov a, S.A. Tretiakov a, R.M. Grechishkin a, K.A. Morozova a, K.B. Yushkov b, V.Ya. Molchanov b and B.B.J. Linde c
aTver State University, 170100 Tver, Russia
bNational University of Science and Technology "MISIS", 119049 Moscow, Russia
cInstitute of Experimental Physics, University of Gdańsk, 80-952 Gdańsk, Poland
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An exact equation of the isochromatic fringes of uniaxial crystals derived without usually adopted simplifications is presented. It enables to calculate the optical conoscopic figures for ideal crystals with different angular orientations of the optical axis with respect to the normal to the crystal surface. Conoscopic figures of large-size single crystals of lithium niobate and paratellurite were examined experimentally making use of a laser-based setup. The conoscopic figure evolution in operating acousto-optic devices was studied.

DOI: 10.12693/APhysPolA.127.84
PACS numbers: 42.79.Jq, 65.40.-b