Influence of gamma-ray irradiation on absorption and fluorescent spectra of Nd : YAG and Yb : YAG laser crystals

abstract

We investigate the influence of gamma-ray irradiation on the absorption and fluorescent spectra of Nd(3+):Y(3)A(15)O(12) (Nd:YAG) and Yb(3+):Y(3)A(l5)O(12) (Yb:YAG) crystals grown by the Czochralski method. Two additional absorption (AA) bands induced by gamma-ray irradiation appear at 255 nm and 340 nm. The former is contributed due to Fe(3+) impurity, the latter is due to Fe(2+) 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 100 Mrad 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.

keywords

INDUCED COLOR-CENTERS; CZOCHRALSKI METHOD; GROWTH

subject category

Physics

authors

Sun, DL; Zhang, QL; Xiao, JZ; Luo, JQ; Jiang, HH; Yin, ST

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