Nd/Y共掺CaF<sub>2</sub>单晶的光谱与激光性能

采用温梯法生长了两种不同掺杂浓度的Nd,Y∶CaF2晶体（0.6%Nd,5%Y∶CaF2，0.8%Nd,5%Y∶CaF2,其浓度均由原子数分数表示）,并测试了两种晶体样品的吸收光谱、发射光谱和荧光寿命。实验发现共掺Y3+可有效抑制浓度猝灭效应，改善晶体的光谱性能。共掺Y3+后Nd,Y∶CaF2在1.06 μm处的发射带宽达到26 nm，其带宽与钕玻璃相当。光谱测试表明两种晶体的最强发射峰均位于1054 nm，其中0.6%Nd,5%Y∶CaF2的荧光寿命为333 μs，发射截面为3.6×10-20 cm2，荧光量子效率为76.7%。采用0.6%Nd,5%Y∶CaF2晶体在1.56 W的抽运功率下获得了413.3 mW 的连续激光输出，斜率效率达到28.15%。

Abstract

Two different doping concentrations Nd, Y∶CaF2 crystals (0.6%Nd, 5%Y∶CaF2 and 0.8%Nd, 5%Y∶CaF2, represented by fraction of number of atoms) are obtained by the temperature gradient technique (TGT) method. The absorption and emission spectra, emission lifetimes, laser properties are studied. It is found that codoped Y3+ ions can effectively inhibit the concentration quenching effect and improve the spectral properties of the crystal. The broad and flat emission spectra around 1.06 μm is observed in Nd,Y∶CaF2 crystals, and the emission bandwidths is 26 nm, which is very close to the Nd-glass. While the strongest emission line is at 1054 nm, the fluorescence lifetime, emission cross section, and quantum efficiency of 0.6%Nd, 5%Y∶CaF2 are estimated as 333 μs, 3.6×10-20 cm2, and 76.7%, respectively. The room temperature continuous wave (CW)-laser oscillation is achieved using 0.6%Nd, 5%Y∶CaF2 crystal. The maximum output power is about 413.3 mW, with the slope efficiency of 28.5%.

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曹月鑫, 姜大朋, 詹曜宇, 苏良碧, 马凤凯, 汪传勇, 王静雅, 钱小波, 唐飞, 杨秋红, 徐军. Nd/Y共掺CaF₂单晶的光谱与激光性能[J]. 中国激光, 2013, 40(s1): s106002. Cao Yuexin, Jiang Dapeng, Zhan Yaoyu, Su Liangbi, Ma Fengkai, Wang Chuanyong, Wang Jingya, Qian Xiaobo, Tang Fei, Yang Qiuhong, Xu Jun. Spectroscopic and Laser Properties of Nd/Y-Codoped CaF₂ Single Crystals[J]. Chinese Journal of Lasers, 2013, 40(s1): s106002.

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