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Crystals 2019, 9(4), 197; https://doi.org/10.3390/cryst9040197

Temperature Dependence of Raman Frequency Shift in SrWO4 Crystal Studied by Lattice Dynamical Calculations

1
Department of Electrical and Electronic Engineering, School of Engineering, Chukyo University, 101-2 Yagoto Honmachi, Showa-ku, Nagoya-shi 466-8666, Japan
2
Prokhorov General Physics Institute Russian Academy of Sciences, Vavilov Str., 38, 119991 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 19 February 2019 / Revised: 27 March 2019 / Accepted: 2 April 2019 / Published: 7 April 2019
(This article belongs to the Special Issue Crystalline Raman Lasers)
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Abstract

The frequency shift of the Raman modes in strontium tungstate (SrWO4) was investigated in the temperature range from 15 to 295 K. The experimental temperature dependence of the shift was analyzed using both the lattice dynamical calculations and the lattice perturbative approach. We found that the quartic anharmonic term of the first-order perturbation and the cubic term of the second-order perturbation, as well as the thermal expansion, contribute to the temperature shift of the highest-frequency Ag1) mode. The values of the temperature sensitivity of the frequency shift of the Raman modes at room temperature were measured, which is important for developing high-power crystalline Raman lasers and frequency shifters. View Full-Text
Keywords: Raman spectra; stimulated Raman scattering; lattice dynamical calculations; phonon dispersion; strontium tungstate; Raman laser Raman spectra; stimulated Raman scattering; lattice dynamical calculations; phonon dispersion; strontium tungstate; Raman laser
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Suda, J.; Zverev, P.G. Temperature Dependence of Raman Frequency Shift in SrWO4 Crystal Studied by Lattice Dynamical Calculations. Crystals 2019, 9, 197.

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