Ukrainian Journal of Physical Optics 

Number  2, Volume 4,  2003

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Appearance of Optical Vortex at Conical Refraction. Examples of NaNO2 and YFeO3 Crystals  
1Vlokh R., 2Volyar A., 1Mys O., 1Krupych O.

1Institute of Physical Optics, 23 Dragomanov Street, 79005 L’viv, Ukraine
2Physical Department, National Tavrida V.Vernandsky University, 4 Yaltinska Street, 95007 Simpheropol, Crimea, Ukraine

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In the present paper it is shown that effect of conical refraction is accompanied by a generation of vortex due to the existing singularities on the surfaces of phase and group velocities in biaxial crystals. This fact is confirmed experimentally by the studies of conical refraction in YFeO3 and interference patterns in NaNO2 crystals. The angle of external conical refraction in YFeO3 crystals determined by us is equal to 4.2o.

Key words: conical refraction, optical vortex, biaxial crystals
PACS: 42.15.Dp, 78.20.Fm, 65.57.Fg

doi 10.3116/16091833/4/2/90/2003

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