双折射
折射率
材料科学
垂直的
光学
压力(语言学)
波长
激发
电场
相(物质)
光电子学
化学
物理
数学
几何学
量子力学
语言学
哲学
有机化学
作者
Masaki Wada,Kazuki Mitsui,Yukihide Ishibashi,Akira Saitoh,Keiji Tanaka
标识
DOI:10.1016/j.jnoncrysol.2022.122017
摘要
The birefringence in As2S3 glass that is induced by either uniaxial stress or illumination with linearly-polarized light (ħω = 2.0 and 2.3 eV) is comparatively studied using a specially-designed phase meter operating at a wavelength of 633 nm (∼2.0 eV). The photoelastic constant of As2S3 is negative (−6 × 10−12 Pa−1): the refractive index parallel to an applied uniaxial stress becomes smaller, which is contrastive to that (+3.5 × 10−12 Pa−1) in SiO2 glass. On the other hand, the photoinduced birefringence in As2S3 is also negative; i.e., the refractive index in the direction parallel to the electric field of excitation light becomes smaller than the perpendicular. These resembling features with comparable magnitudes of the stress- and photo-induced birefringences imply common structural origin. We propose that the negative birefringences can be understood by a unified model that assumes anisotropically-aligned segmental layer structures which are produced by mechanical and photo-structural atomic motions.
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