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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 >Refractive index changes in photochromic SbPO_4-WO_3 glass by exposure to band-gap radiation
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Refractive index changes in photochromic SbPO_4-WO_3 glass by exposure to band-gap radiation

机译：暴露于带隙辐射的光致变色SbPO_4-WO_3玻璃的折射率变化

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摘要

We report photoinduced photo-darkening in SbPO_4-WO_3 glass by exposure to 532 nm light with a power density of 143 mW/cm~2. The time of exposure was varied between 0 and 256 min following which visible photo-darkening, peaking at 850 nm was observed. Spectrophotometer measurement of absorption was performed for both treated and untreated regions of the sample. Time exposure to below band-gap light results in a single exponent Gaussian absorption function over an exceptionally wide range of wavelengths (500 nm-1600 nm), with a 1/e width of 647.5 nm. Kramers-Kronig transform of the change in the absorption indicates a negative local change in the refractive index. The dispersed refractive index change at 1550 nm, n, is calculated to be ～-5 × 10~(- 8). The peak absorption increases with time of exposure and the photo-darkening remains irreversible at room temperature.
机译：我们通过暴露于功率密度为143 mW / cm〜2的532 nm光中，在SbPO_4-WO_3玻璃中报告了光致光暗化。曝光时间在0至256分钟之间变化，之后观察到可见的光暗化，在850nm处达到峰值。用分光光度计测量样品的已处理和未处理区域的吸收。对低于带隙光的时间曝光会在极宽的波长范围（500 nm-1600 nm）内产生单指数高斯吸收函数，其1 / e宽度为647.5 nm。吸收率变化的Kramers-Kronig变换表明折射率的负局部变化。计算出在1550 nm处的分散折射率变化n为〜-5×10〜（-8）。峰值吸收随着曝光时间的增加而增加，并且在室温下，光暗化保持不可逆。

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