Sintering additives regulated Cr ion charge state in Cr doped YAG transparent ceramics |
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| Authors: | Tianyuan Zhou Le Zhang Cen Shao Bingheng Sun Wei Bu Hao Yang Hao Chen Farida A Selim Qitu Zhang |
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| Affiliation: | 1. Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronics Engineering, Jiangsu Normal University, Xuzhou 221116, PR China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, PR China;4. Center for Photochemical Sciences, Department of Physics and Astronomy, Bowling Green State University, Bowling Green 43403, USA |
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| Abstract: | Cr: YAG and Cr, Nd: YAG transparent ceramics have significant application prospects in solid state lasers, therefore a controllable charge state of Cr ion in Cr doped YAG transparent ceramics is necessary. In this study, a successful regulation of Cr charge state in both Cr, Nd: YAG and Cr: YAG transparent ceramics was achieved, by a simple optimizing the sintering additives. Both ceramics with the Cr doping concentration of 0.3?at% reached to the theoretical transmittance, after the vacuum sintering and the subsequent annealing process. It was found that by adopting silica additive, divalent charged Cr2+ ions could be detected from the vacuum sintered samples, and they were transferred into trivalent state after further annealing in air. Meanwhile, by vacuum sintering ceramics with divalent additives (CaO and MgO), a stable trivalent charged Cr ion could be obtained, and the subsequent air annealing process indicated a significant conversion from Cr3+ to Cr4+. Further increasing the Cr concentration was not benefit to the optical quality as well as the conversion of Cr3+ ion in Cr, Nd: YAG transparent ceramics. |
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| Keywords: | Transparent YAG ceramic Sintering additive Charge state Annealing Optical quality |
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