Ukrainian Journal of Physical Optics

Number 4, Volume 2, 2001

Peculiarities of temperature behaviour of the optical birefringence in a-ZnP₂ crystals
Kushnir O.S., Bevz O.A., Kapustianik V.B., Korchak Yu.M., Polovinko I.I., Sveleba S.A.

Physics Department, Lviv Ivan Franko National University 8 Kyrylo and Mefodiy Str., 79005 Lviv, Ukraine

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Using the Senarmont technique, the optical birefringence of tetragonal a-ZnP₂ single crystals is studied in the temperature range 20 -180 °C. Under certain conditions that depends on thermal prehistory of the sample, the birefringence exhibits a quasi-oscillatory temperature behaviour. The explanation of the effect related to the multiple light reflections is considered quantitatively, involving the data for the optical absorption. The hypothesis is shown to have serious difficulties. An alternative explanation of the effect related to the existence in a-ZnP2 of incommensurate structure is critically analyzed.

Keywords: crystal optics, birefringence, absorption, multiple reflections, incom-mensurate structure

doi 10.3116/16091833/2/4/203/2001

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