Abstract
The peculiarities of photoelastic and acousto-optic effects are first tested in chalcohalide 65GeS2-25Ga2S3-10CsCl glass exploring the interferometry method. The determined piezo-optic coefficients occur to be (in Br) π11=2.8±0.6, π12=6.0±0.9 and π44=−3.2±1.1. In respect to maximal acousto-optic figure of merit М2=55.6·10−15s3/kg proper for longitudinal acoustic wave propagation and polarization along X2 (і=2) direction, this glass seems more perspective for photoelastic and acousto-optic modulation in visible and near IR ranges, than many alternative candidates, such as crystalline quartz, LiNbO3, CaWO4, PbMoO4, β-BaB2O4, etc. For the first time it has been shown that piezo-optic effect of isotropic solids is anisotropic, and the degree of anisotropy is the difference of π11–π12 coefficients.
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