Elastic and elasto‐optical properties of Rb_1–x(NH₄)_xH₂AsO₄ mixed crystals studied by Brillouin spectroscopy

Abstract

The elastic and elasto-optical properties of Rb 1-x (NH 4 ) x H 2 AsO 4 mixed crystals were studied by Brillouin spectroscopy at room temperature. The measurements were made on single crystals obtained from the aqueous solution by slow evaporation. The behaviour of bulk phonons propagating in investigated crystals was studied for different polarisations of incident and scattered beam. The components of the tensors of elasto-optical and elastic properties of the crystals studied were determined.

Brillouin Scattering and its Application in Geosciences

“…While in transparent media, the photoelastic constants have been determined for many materials (crystalline and amorphous solids) from bulk phonons (Grimsditch and Ramdas 1976;Heiman et al 1979;Schroeder 1980;Rand and Stoicheff 1982;Trzaskowska et al 2010) constraining the full tensor in opaque materials is a much more difficult task due to the weakness of the Brillouin scattering by elasto-optic coupling and the larger relative intensity of ripple scattering (which is insensitive to the elasto-optic coupling). Subsets of the photoelastic tensor can still be constrained in semi-opaque materials by investigating the dispersion of surface waves and by fitting the spectral intensities (when the elastic constants are known) with the use of the elasto-optic constants as free parameters (Marvin et al 1980b;Bassoli et al 1986).…”

Фотоупругие Свойства Кристаллов Сульфата Калия

“…В последнее время существенно увеличилось количество работ, посвященных изучению фотоупругости (пьезои упругооптический эффекты) в кристаллах, имеющих разные классы симметрии [1][2][3][4][5][6][7][8][9]. Это обусловлено поиском новых оптических материалов с высокой акустооптической (АО) эффективностью.…”