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Influence of Gamma-Ray Irradiation on Absorption and Fluorescent Spectra of Nd:YAG and Yb:YAG Laser Crystals |
| SUN Dun-Lu1,2;ZHANG Qing-Li1;XIAO Jing-Zhong2;LUO Jian-Qiao1;JIANG Hai-He1;YIN Shao-Tang1 |
| 1Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 2300312Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Aveiro 3810-193, Portugal |
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SUN Dun-Lu, ZHANG Qing-Li, XIAO Jing-Zhong et al 2008 Chin. Phys. Lett. 25 2081-2084 |
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Abstract We investigate the influence of gamma-ray irradiation on the absorption and fluorescent spectra of Nd3+:Y3Al5O12 (Nd:YAG) and Yb3+:Y3Al5O12 (Yb:YAG) crystals grown by the Czochralski method. Two additional absorption (AA) bands induced by gamma-ray irradiation appear at 255nm and 340nm. The former is contributed due to Fe3+ impurity, the latter is due to Fe2+ ions and F-type colour centres. The intensity of the excitation and emission spectra as well as the fluorescent lifetime of Nd:YAG crystal decrease after the irradiation of 100Mrad gamma-ray. In contrast, the same dose irradiation does not impair the fluorescent properties of Yb:YAG crystal. These results indicate that Yb:YAG crystal possesses the advantage over Nd:YAG crystal that has better
reliability for applications in harsh radiant environment.
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42.70.Hj
61.72.Ji
61.80.Ed
78.55.-m
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Received: 26 November 2007
Published: 31 May 2008
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