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Photoinduced nonlinear optics in Sb_2Se_3--BaCl_2--PbCl_2 glasses

机译：Sb_2Se_3--BaCl_2--PbCl_2玻璃中的光致非线性光学

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摘要

Photoinduced structural transformations in amorphous Sb_2Se_3--BaCl_2--PbCl_2 glasses were studied using a differential IR spectroscopy Fourier technique in the spectral region between l00 and 300 cm~-l. A stage of the reversible pho- todarkening is realized in the Sb_2Se_3 fragments after the first cycle of photoexposure and thermoannealing. The whole scheme of the photo- and thermoinduced transformations in the amorphous system may be explained as a coordination of formation and annihilation of defects. The vibrational density of states calculated using quantum chemical so1id state methods confirms our experimental results and their interpretation. Photoinduced photodarkening changes using a CO_2 pulse laser (λ = l0.6 μm) in new synthesized Sb_2Se_3--BaCl_2--PbCl_2 glasses were investigated. At the same time we have studied photoinduced second harmonic generation (SHG) and two-photon absorption (TPA). The possibility of using this glass as perspective materials for IR optoelectronics and nonlinear optics was shown.
机译：利用差分红外光谱傅里叶技术研究了非晶态Sb_2Se_3--BaCl_2-PbCl_2玻璃中的光诱导结构转变，其范围为100-300 cm-1。在第一个曝光和热退火循环后，Sb_2Se_3片段实现了可逆的光暗化阶段。非晶态系统中光和热诱导转变的整个方案可以解释为缺陷形成和an灭的协调。使用量子化学固体态方法计算的态的振动密度证实了我们的实验结果及其解释。研究了CO_2脉冲激光（λ=10.6μm）对新合成的Sb_2Se_3--BaCl_2-PbCl_2玻璃的光致暗化变化。同时，我们研究了光致二次谐波（SHG）和双光子吸收（TPA）。显示了使用这种玻璃作为红外光电和非线性光学的透视材料的可能性。

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