Effects of annealing treatment and gamma irradiation on the absorption and fluorescence spectra of Cr : GSGG laser crystal

resumo

The influence of annealing treatments and gamma-ray irradiation on the absorption and fluorescence spectra of Cr:GSGG crystals grown by the Czochralski method has been investigated. Two absorption bands located near 686 nm and 1050 nm were weakened markedly after the crystal was re-annealed in H-2 atmosphere, which is due to the Cr4+ ions being de-oxidized into Cr3+ ions. The other two weak additional absorption bands induced by gamma-ray irradiation appearing near 310 nm and 480 nm are ascribed to the Fe2+ ions and F-type color centers, respectively. In particular, the gamma-ray irradiation with a dose of 100 Mrad has an effect of improving slightly the luminescence properties of Cr:GSGG crystals. The improvement mechanism is analyzed and discussed.

palavras-chave

COLOR-CENTERS; SINGLE-CRYSTALS; LASING PROPERTIES; GARNET; IONS; YAP; ND

categoria

Optics; Physics

autores

Sun, DL; Luo, JQ; Xiao, JZ; Zhang, QL; Jiang, HH; Yin, ST; Wang, YF; Ge, XW

Grupos

agradecimentos

This work was financially supported by the Knowledge Innovation Program of the Chinese Academy of Sciences and the National Natural Science Foundation of China under Grant No. 50772112.

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