Nd:YAG复合激光晶体的温度分布模拟及激光性能

IF 3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-09-24 DOI:10.1016/j.rio.2025.100899

Zhao Chen , Fei Li , Wenpeng Liu , Yufa Zhang , Qingli Zhang

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引用次数: 0

摘要

采用热键合法制备了YAG/Nd:YAG和YAG/Nd:YAG/YAG复合激光晶体。研究了LD端泵浦条件下Nd:YAG、YAG/Nd:YAG和YAG/Nd:YAG/YAG晶体的温度分布和激光性能。实现了波长为1064 nm和946 nm的激光输出。温度模拟结果表明，在20 W泵浦功率下，YAG/Nd:YAG/YAG晶体比Nd:YAG晶体温度降低了15 K，端面温度降低了33 K。在20 W泵浦下，YAG/Nd:YAG/YAG晶体在1064 nm处的最大连续输出功率为4.412 W，在946 nm处的最大连续输出功率为668 mW，斜率效率分别为34.66%和6.68%，光-光转换效率分别为34.77%和5.99%。与Nd:YAG晶体相比，输出功率分别提高了1.6倍和1.8倍，斜率效率分别提高了13.4%和4.33%，转换效率分别提高了9.31%和3.92%。YAG/Nd:YAG/YAG晶体的光束质量优于Nd:YAG/YAG复合晶体和Nd:YAG晶体，且M2因子较低。结果表明，YAG/Nd:YAG/YAG复合晶体具有较好的冷却效率，有利于降低热透镜效应，提高激光效率。

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Temperature distribution simulation and laser performance of Nd:YAG composite laser crystals

YAG/Nd:YAG and YAG/Nd:YAG/YAG composite laser crystals were fabricated through thermal bonding method. The temperature distribution and laser properties of Nd:YAG, YAG/Nd:YAG and YAG/Nd:YAG/YAG crystals under LD end-pumping conditions were studied. Laser outputs with wavelengths of 1064 nm and 946 nm have been achieved. Temperature simulation results revealed that at 20 W pump power, the YAG/Nd:YAG/YAG crystal exhibited 15 K lower temperature compared to Nd:YAG crystal, with a 33 K reduction in end-face temperature. Under 20 W pumping, the maximum continuous-wave output powers of YAG/Nd:YAG/YAG crystal reached 4.412 W at 1064 nm and 668 mW at 946 nm, corresponding to slope efficiencies of 34.66 % and 6.68 %, and optical-to-optical conversion efficiencies of 34.77 % and 5.99 %, respectively. These values represent 1.6-fold and 1.8-fold improvements in output power, 13.4 % and 4.33 % enhancements in slope efficiency, as well as 9.31 % and 3.92 % increases in conversion efficiency compared to Nd:YAG crystal. Moreover, the YAG/Nd:YAG/YAG crystal demonstrated superior beam quality with lower M² factors than both Nd:YAG/YAG composite crystal and Nd:YAG crystal. It is shown that the composite YAG/Nd:YAG/YAG crystal has better cooling efficiency, which is beneficial to reduce the thermal lens effect and improve the laser efficiency.

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