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Comparative Study of Composition Dependences of Photorefractive and Related Effects in LiNbO_3 and LiTaO_3 Crystals

机译:LiNbO_3和LiTaO_3晶体中光折变的成分依赖性和相关效应的比较研究

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摘要

The results of a comparative study of composition dependences of the light-induced refractive index change, photorefractive sensitivity, polaron luminescence, and intrinsic optical absorption in nominally pure LiNbO_3 and LiTaO_3 crystals are reported. Our investigation demonstrates that the particular light-induced defects traced by the photoluminescence are secondary photorefractive centers itself. The experimental results obtained are well described by light-induced dissociation of bipolarons into small polarons that are unstable at room temperature.
机译:报道了在名义上纯的LiNbO_3和LiTaO_3晶体中光诱导的折射率变化,光折光敏感性,极化子发光和固有光吸收的成分依赖性的比较研究结果。我们的研究表明,由光致发光引起的特定的光致缺陷是次级光折变中心本身。通过将双极化子光诱导解离为在室温下不稳定的小极化子,可以很好地描述获得的实验结果。

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