Baric changes in refractive indices of K2ZnCl4 crystals

The influence of uniaxial pressure applied along the principal crystallophysical directions on the dispersion and temperature dependences of the refractive indices n i of K 2 ZnCl 4 crystals has been investigated. The n i values are found to be fairly sensitive to uniaxial pressure, whereas an uniax...

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Bibliographic Details
Published in:Optics and spectroscopy 2010-05, Vol.108 (5), p.753-760
Main Authors: Stadnyk, V. Yo, Romanyuk, M. O., Andrievsky, B. V., Kogut, Z. O.
Format: Article
Language:English
Subjects:
Condensed-Matter Spectroscopy
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
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Summary:The influence of uniaxial pressure applied along the principal crystallophysical directions on the dispersion and temperature dependences of the refractive indices n i of K 2 ZnCl 4 crystals has been investigated. The n i values are found to be fairly sensitive to uniaxial pressure, whereas an uniaxial stress does not change the behavior of the dispersion and temperature dependences of n i . The baric changes in n i have been studied. The electronic polarizability α i , refractions R , and parameters of UV oscillators (λ 0 i , B 1 i ) of mechanically deformed K 2 ZnCl 4 crystals have been calculated. The contributions of UV and IR oscillators to n i (λ) have been estimated for different temperatures, spectral regions, and stresses. A significant baric shift of the points of the paraelectric phase-incommensurate phase-commensurate phase transitions to different temperature ranges, depending on the direction of pressure application, is found; this shift is due to the effect of uniaxial stress on the K 2 ZnCl 4 crystal structure.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X10050139