Ukrainian Journal of Physical Optics 

Number  3, Volume  2, September  2001

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Measurements of optical gyration in incommensurate (N(CH3)4)2ZnCl4 crystals with the universal null-polarimeter  
*Kushnir O.S., *Lutsiv-Shumski L.P., *Polovinko I.I., **Vlokh O.G.

* Physics Department, Lviv Ivan Franko National University, 8 Kyrylo and Mefodiy Str., 79005 Lviv, Ukraine
** Institute of Physical Optics, 23 Dragomanov Str., 79005 Lviv, Ukraine

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Using the improved universal null-polarimetric technique, the birefringence, optical indicatrix orientation and the gyration of the (001)-plate of (N(CH3)4)2ZnCl4 crystals are re-studied in the temperature region close to normal-to-incommensurate phase transition. Both phases show a certain zero indicatrix rotation, while the gyration component g33 in the incommensurate phase is at least less than 2.10-8. The sources of the interpretation polarimetric errors which decrease the accuracy of the universal polarimeter and the HAUP are analyzed. Possible reasons for the residual gyration are discussed.

Key words: phase transitions, incommensurate phase, symmetry, gyration, polarimetry, HAUP
 

doi 10.3116/16091833/2/3/126/2001
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