Calculation of Spectroscopic Parameters of Highly Doped Er3+ in Lithium Niobate
SUN Dun-lu1, ZHANG Qing-li1, WANG Ai-hua1, HANG Yin2, ZHANG Lian-han1, QIAN Xiao-bo2, ZHU Shi-ning3, YIN Shao-tang1
1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201821, China 3. State Key Laboratory of Solid Microstructures, Nanjing University, Nanjing 210093, China
Abstract：A highly doped Er3+:LiNbO3 (concentration 6 mol%) crystal was grown successfully by Czochralski method. The absorption coefficient of the grown crystal is higher than that of the lowly doped Er3+ in LiNbO3 crystal, which is helpful to improve the pumping efficiency. The absorption spectra at two unpolarized directions (X and Z) and two polarized directions (E‖Z, E⊥Z) were measured. Using the Judd-Ofelt theory, and according to the measured absorption spectra, the intensity parameters Ωλ of Er3+ were fitted. The results of root-mean square (r.m.s) deviation show that the error of polarized fitting is less than that of unpolarized one. Thus fluorescence transition probabilities (AJJ′), radioactive lifetime (τ), fluorescence branching ratio (β)，and integrated emission cross section (σp) were calculated and accepted according to the polarized results, and were also discussed and compared with the ones reported in the literature.
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