Optical spectroscopy and laser parameters of Zn²⁺/Er³⁺/Yb³⁺-tridoped LiNbO₃ crystal

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• 作者：Yannan Qian ; Rui Wang ; ^{wangrui001@hit.edu.cn} ; Chao Xu ; Xiaohong Wu ; Lili Xing ; Yanling Xu
• 关键词：Zn/Er/Yb ; LiNbO3 ; Judd&ndash ; Ofelt theory ; McCumber ; Fü ; chtbauer&ndash ; Ladenburg ; Gain cross section ; Upconversion
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：August, 2012
• 卷：132
• 期：8
• 页码：1976-1981
• 文件大小：401 K

摘要

The Zn/Er/Yb:LiNbO₃ and Er/Yb:LiNbO₃ crystals were grown by the Czochralski technique. The laser characteristics of 1.54 渭m emission were predicted based on the Judd-Ofelt theory, and the intensity parameters 惟_t (惟₂=7.23脳10^鈭?0 cm², 惟₄=3.15脳10^鈭?0 cm² and 惟₆=1.43脳10^鈭?0 cm²) were obtained. The stimulated emission cross sections (蟽_em) at 1.54 渭m emission in Zn/Er/Yb:LiNbO₃ were calculated based on the McCumber theory and the F眉chtbauer-Ladenburg theory. The gain cross section spectrum of Zn/Er/Yb:LiNbO₃ crystal was also investigated. Under 980 nm excitation, a lenghthening lifetime of 1.54 渭m emission and an enhancement of green upconversion emission were observed for Zn/Er/Yb:LiNbO₃ crystal. The studies on the power pump dependence and the upconversion mechanism suggested that both green and red upconversion emissions were populated via the three-photon process, and Zn²⁺ ion tridoping increases the probability of cross relaxation process between the two neighboring Er³⁺ ions.