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Optics and Spectroscopy, 2021 Volume 129, Issue 2, Pages 189–195 (Mi os190)

This article is cited in 1 paper

Physical optics

On isotropic states in doped K$_{2}$SO$_{4}$ crystals

V. I. Stadnika, R. B. Matviiva, R. S. Brezvina, P. A. Shchepanskyiab, Z. A. Kogutc

a Ivan Franko National University of L'viv
b J. Dlugosh University in Czestochowa, Czestochowa, Poland
c Lviv Polytechnic National University

Abstract: The temperature, spectral and pressure dependences of the birefringence $\Delta n_{i}$ of potassium sulfate crystals doped with 1.7% of copper have been studied. The introduction of the impurity is found to change the absolute value of $\Delta n_i$ and lead to an increase in the temperature dependence of $\Delta n_{i}(T)$. It is shown that the isotropic points appear in the doped crystal of potassium sulfate, and are shifted, compared with a pure crystal, towards low temperatures by 5 K and 11 K, respectively. It was established, that uniaxial stresses change the magnitude of the $\Delta n_{i}$ absolute values, as well as the region of existence of the isotropic state. Generalized temperature-spectral-baric diagrams of the isotropic state of doped potassium sulfate crystal are constructed, making it possible to use them as a crystal-optical sensor.

Keywords: birefringence, isotropic point, dispersion, uniaxial pressures, diagrams, crystal-optics sensors.

Received: 08.04.2020
Revised: 19.10.2020
Accepted: 30.10.2020

DOI: 10.21883/OS.2021.02.50556.130-20


 English version:
Optics and Spectroscopy, 2021, 129:2, 227–233

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© Steklov Math. Inst. of RAS, 2024