Nd∶GdYAG激光晶体的光谱分析及热学性能研究

人工晶体学报 ›› 2024, Vol. 53 ›› Issue (9): 1504-1511.

Nd∶GdYAG激光晶体的光谱分析及热学性能研究

窦仁勤^1,2, 刘耀^1,2,3, 罗建乔^1,2, 王小飞^1,2, 刘文鹏^1,2, 张庆礼^1,2

1.中国科学院合肥物质科学研究院,安徽光学精密机械研究所,光子器件与材料安徽省重点实验室,合肥 230031;
2.先进激光技术安徽省实验室,合肥 230037;
3.中国科学技术大学,合肥 230026

收稿日期:2024-05-30 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 张庆礼,博士,教授。E-mail:zql@aiofm.ac.cn
作者简介:窦仁勤(1987—),女,安徽省人,博士,副研究员。E-mail:drq0564@aiofm.ac.cn
基金资助:
国家自然科学基金(52272011);国家重点研发计划(2023YFB3507403,2022YFB3605700);中国科学院青年创新促进会(2023463)

Spectral Analysis and Thermal Properties of Nd∶GdYAG Laser Crystal

DOU Renqin^1,2, LIU Yao^1,2,3, LUO Jianqiao^1,2, WANG Xiaofei^1,2, LIU Wenpeng^1,2, ZHANG Qingli^1,2

1. Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2. Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China;
3. University of Science and Technology of China, Hefei 230026, China

Received:2024-05-30 Online:2024-09-15 Published:2024-09-19

摘要/Abstract

摘要： 本文对所生长的Nd∶GdYAG晶体的吸收光谱和荧光光谱进行了测试,采用Judd-Ofelt理论对振子强度和线强、强度参数Ω_t、⁴F_3/2→⁴IJ能级间的跃迁概率、能级辐射寿命、荧光分支比等光谱参数进行了计算,相关数据与YAG、LuAG、YVO₄等晶体进行了对比。Ω_t计算得出Ω₂=(0.813±0.200)×10^-20 cm²,Ω₄=(3.381±0.187)×10^-20 cm²,Ω₆=(5.135±0.278)×10^-20 cm²,相比YAG、LuAG、YVO₄等晶体,Nd∶GdYAG晶体的强度参数Ω₂较大,表明Gd³⁺的掺入增大了基质的无序度。计算并拟合了300~1 200 nm的吸收截面和折射率,其中808 nm处的吸收截面为5.0×10^-20 cm², 1 064 nm处的折射率为1.80。实测⁴F_3/2能级的荧光寿命为228 μs,与计算的能级辐射寿命240 μs接近;1 064 nm处的发射截面为1.23×10^-19 cm²,接近Nd∶YAG晶体的发射截面。室温下Nd∶GdYAG晶体的热导率为5.992 W/(m·K),略小于Nd∶YAG和Nd∶GGG,但大于Nd∶YVO₄晶体。研究表明,Nd∶GdYAG是一种有应用前景的新型激光晶体材料。

关键词: 激光晶体, Nd∶GdYAG, 光谱分析, Judd-Ofelt理论, 热导率

Abstract: The adsorption and fluorescence spectra of the grown Nd∶GdYAG were measured. The spectral parameters, such as oscillator strength, line strength, intensity parameter Ω_t, transition probability between ⁴F_3/2→⁴I_J levels, radiation lifetime, and fluorescence branching ratio, were calculated with Judd-Ofelt theory. The calculated Ω_t are Ω₂=(0.813±0.200)×10^-20 cm², Ω₄=(3.381±0.187)×10^-20 cm², Ω₆=(5.135±0.278)×10^-20 cm², respectively. Compared with Nd-doped YAG, LuAG, YVO₄, and other crystals, Nd∶GdYAG crystal has a larger Ω₂, showing that the addition of Gd³⁺increases the disorder of the host. The absorption cross-section and refractive index in the range of 300~1 200 nm were calculated and fitted. The absorption cross-section at 808 nm is 5.0×10^-20 cm². The refractive index at 1 064 nm is 1.80. The measured fluorescence lifetime of ⁴F_3/2 level is 228 μs, which is close to the calculated radiation lifetime of 240 μs. The emission cross-section at 1 064 nm is 1.23×10^-19 cm², which is close to that of Nd∶YAG crystal. Addition, at room temperature, the thermal conductivity of Nd∶GdYAG crystal is 5.992 W/(m·K), which is slightly smaller than that of Nd∶YAG and Nd∶GGG, but larger than that of Nd∶YVO₄ crystal. The results show that Nd∶GdYAG is a promising new laser crystal material.

Key words: laser crystal, Nd∶GdYAG, spectral analysis, Judd-Ofelt theory, thermal conductivity

中图分类号:

O734
O657.3

窦仁勤, 刘耀, 罗建乔, 王小飞, 刘文鹏, 张庆礼. Nd∶GdYAG激光晶体的光谱分析及热学性能研究[J]. 人工晶体学报, 2024, 53(9): 1504-1511.

DOU Renqin, LIU Yao, LUO Jianqiao, WANG Xiaofei, LIU Wenpeng, ZHANG Qingli. Spectral Analysis and Thermal Properties of Nd∶GdYAG Laser Crystal[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2024, 53(9): 1504-1511.

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