Physical optics

Effects of degenerate light diffraction on a periodic domain structure in 1% MgO : LiTaO$_3$ in the temperature range of 30 – 110$^\circ$C

A. V. Dubikov^a, E. N. Savchenkov^a, D. E. Belskaya^a, S. M. Shandarov^a, N. I. Burimov^a, S. V. Smirnov^a, A. R. Akhmatkhanov^b, M. A. Chuvakova^b, V. Ya. Shur<sup>b

a</sup> Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia
^b Ural Federal University named after the First President of Russia B. N. Yeltsin, Yekaterinburg, Russia

Abstract: The effects of degenerate anisotropic diffraction were observed for the first time on a periodic regular domain structure (RDS) formed in it with non-inclined $Y$-type walls for a probing beam with a wavelength of $\lambda$ = 632.8 nm at temperatures below and above the isotropic point in a stoichiometric crystal of 1% MgO : LiTaO$_3$. The use of experimentally measured maximum efficiency values for two-fold degenerate diffraction processes with an unusual and ordinary probing beam made it possible to obtain an estimate of В for the flexoelectric tensor components of the studied lithium tantalate sample. The temperature of the isotropic point 69.31$^\circ$C was determined and the temperature dependences of birefringence in the range from 30 to 110$^\circ$C were approximated from the analysis of experimental temperature dependences for the transmitted power through the 1% MgO : LiTaO$_3$ crystal and a crossed analyzer of a probing beam with a polarization vector oriented at an angle of 45$^\circ$ to the Z axis.

Keywords: lithium tantalate, degenerate diffraction, isotropic point, flexoelectric tensor component.

Received: 13.05.2024
Revised: 06.06.2024
Accepted: 13.06.2024

DOI: 10.61011/OS.2024.07.58899.6267-24

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