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Structure and optical properties of Li2Ga2GeS6 nonlinear crystal

机译：Li2Ga2GeS6非线性晶体的结构和光学性质

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Structure and optical properties of new nonlinear crystal - Li2Ga2GeS6 single crystal of optical quality, grown by the Bridgman technique were studied. The data on transmission, Raman scattering, luminescence emission, excitation and thermal quenching as well as thermostimulated luminescence are presented. Fundamental absorption edge is determined by the direct allowed electronic transitions: The values of optical band gap are estimated. Absorption band at 8.0 mu m is due to S-S vibrations. Features in photoluminescence spectra are associated with excitons: both free (narrow line at 371 nm) and self-trapped ones (broad bands at 596, 730 and 906 nm). Spontaneous emission in the 80-170 K range, both at crystal heating and cooling, is typical of pyroelectrics: This confirms the absence of symmetry center in Li2Ga2GeS6 and an opportunity of laser frequency nonlinear conversion. (C) 2015 Elsevier B.V. All rights reserved.
机译：研究了用Bridgman技术生长的新型非线性晶体-光学品质的Li2Ga2GeS6单晶的结构和光学性质。给出了透射，拉曼散射，发光发射，激发和热猝灭以及热刺激发光的数据。基本吸收边缘由直接允许的电子跃迁确定：估计光学带隙的值。 8.0微米的吸收带是由于S-S振动引起的。光致发光光谱中的特征与激子相关：自由子（在371 nm处为窄线）和自陷子（在596、730和906 nm处为宽带）。热释电的典型特征是晶体加热和冷却时在80-170 K范围内自发发射：这证实了Li2Ga2GeS6中不存在对称中心，并且存在激光频率非线性转换的机会。 （C）2015 Elsevier B.V.保留所有权利。

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