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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Generation and bleaching of intrinsic color centers in photo-thermo- refractive glass matrix
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Generation and bleaching of intrinsic color centers in photo-thermo- refractive glass matrix

机译：光热折变玻璃基体中固有色心的产生和漂白

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摘要

Photo-thermo-refractive (PTR) glass is a photosensitive multicomponent silicate glass that imparts refractive index change after exposure to ionizing radiation and thermal treatment. The origin of this photosensitivity is explained by thermal precipitation of sodium fluoride crystals controlled by atomic silver nucleation centers. These centers are produced by photo-reduction of silver ions resulted from photoionization (photo-oxidizing) of cerium ions. This feature of PTR glass is successfully used for high efficiency phase hologram recording. However, the mechanism of electric charge exchange (transfer) between these ions is not known and the role of intrinsic electron and hole centers was not studied. To elucidate this problem, pure PTR glass matrix with no dopants was prepared and the subsequent absorption spectra of color centers were studied after excitation of the intrinsic absorption edge of glass matrix. Color centers were bleached by thermal treatment and by optical excitation of induced absorption bands. The analysis of the structure of absorption spectra at different stages of coloration and bleaching led to the deconvolution of complex spectra to Gaussian components. Based on this analysis and comparison with simple silicate glasses, induced absorption bands were assigned to different intrinsic electron and hole centers. Interconversion of different centers is also studied.
机译：光热折射（PTR）玻璃是一种光敏多组分硅酸盐玻璃，在暴露于电离辐射和热处理后，其折射率会发生变化。这种光敏性的起源是由受原子银成核中心控制的氟化钠晶体的热沉淀来解释的。这些中心是由铈离子的光离子化（光氧化）产生的银离子的光还原产生的。 PTR玻璃的这一功能已成功用于高效相全息图记录。但是，这些离子之间电荷交换（转移）的机理尚不清楚，并且未研究本征电子和空穴中心的作用。为了阐明这个问题，制备了没有掺杂剂的纯PTR玻璃基体，并在激发玻璃基体的固有吸收边后研究了色心的后续吸收光谱。通过热处理和诱导吸收带的光激发将色心漂白。对在着色和漂白的不同阶段的吸收光谱结构的分析导致将复杂光谱解卷积为高斯分量。基于此分析并与简单的硅酸盐玻璃进行比较，将感应吸收带分配给了不同的本征电子和空穴中心。还研究了不同中心的相互转换。

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