γ-Ray induced color centers in pure and Yb doped LiYF<sub>4sub> and LiLuF<sub>4sub> single crystals

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• 作者：S&#x142 ; awomir M. Kaczmarek ; Amina Bensalah and Georges Boulon
• 关键词：Color centers ; LiYF<sub>4sub> ; LiLuF<sub>4sub> ; BaY<sub>2sub>F<sub>8sub> ; KY<sub>3sub>F<sub>10sub> ; Induced absorption
• 刊名：Optical Materials
• 出版年：2006
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：2006
• 卷：28
• 期：1-2
• 页码：123-128
• 文件大小：345 K

摘要

γ-Ray irradiation was used to carry out a comparative study of the induced optical absorption phenomena and color center creation in the ultraviolet and visible spectral regions. The F-center absorption band at 315 and 330 nm in LiLuF<sub>4sub> and LiYF<sub>4sub>, respectively, is the dominating induced absorption feature. The amplitude of the induced absorption is reduced by more than a factor of 3 in Yb-doped crystals compared to the undoped ones. Comparison was made with other fluorides, such as CaF<sub>2sub>, KY<sub>3sub>F<sub>10sub> and BaY<sub>2sub>F<sub>8sub>. In Yb-doped CaF<sub>2sub>, LiLuF<sub>4sub>, LiYF<sub>4sub>, BaY<sub>2sub>F<sub>8sub> and KY<sub>3sub>F<sub>10sub> we observed arising of two possible types of Yb<sup>2+sup> centers after γ-ray irradiation. For the entire materials exclude KY<sub>3sub>F<sub>10sub> we found Yb<sup>2+sup> centers related to Yb<sup>3+sup>, as an effect of recharging one of Yb<sup>3+sup> ion from pair, while for KY<sub>3sub>F<sub>10sub> we found mainly Yb<sup>2+sup> centers related to isolated Yb<sup>3+sup> ions, as an effect of Compton electron capturing by isolated Yb<sup>3+sup> ion.