Color centers and charge state recharge in γ-irradiated Yb:YAP

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• 作者：Yongjun Dong ; Guoqing Zhou ; Jun Xu ; Guangjun Zhao ; Fenglian Su ; Liangbi Su ; Hongjun Li ; JiLiang Si ; Xiaobo Qian ; Xiaoqing Li and Jun Shen
• 关键词：Color center ; Defects ; γ ; -ray ; Irradiation ; Yb ; YAP
• 刊名：Optical Materials
• 出版年：2006
• 出版时间：September 2006
• 年：2006
• 卷：28
• 期：12
• 页码：1377-1380
• 全文大小：145 K

文摘

Gamma-ray irradiation induced color centers and charge state recharge of impurity and doped ion in 10 at. % Yb:YAP have been studied. The change in the additional absorption (AA) spectra is mainly related to the charge exchange of the impurity Fe²⁺, Fe³⁺ and Yb³⁺ ions. Two impurity color center bands at 255 and 313 nm were attributed to Fe³⁺ and Fe²⁺ ions, respectively. The broad AA band centered at 385 nm may be associated with the cation vacancies and F-type center. The transition Yb³⁺ → Yb²⁺ takes place in the process of γ-irradiation. Oxygen annealing and γ-ray irradiation lead to an opposite effect on the absorption properties of the Yb:YAP crystal. In the air annealing process, the transition Fe²⁺ → Fe³⁺ and Yb²⁺ → Yb³⁺ take place and the color centers responsible for the 385 nm band was destroyed.