发光学报, 2019, 40 (7): 885, 网络出版: 2019-07-31   

大信号无水冷LD侧泵Nd∶YAG激光放大器

Large Signal LD Side-pumped Nd∶YAG Laser Amplifier Without Water-cooler
作者单位
1 北京工业大学 激光工程研究院, 北京 100124
2 江苏北方湖光光电有限公司, 江苏 无锡 214035
摘要
为了获得高激光脉冲能量, 设计了高能脉冲激光放大系统。对该放大系统的输出能量、脉冲宽度、能量稳定度、输出脉冲宽度等进行了研究。首先, 进行四能级激光速率方程的分析递推出泵浦能量和储存能量、增益系数等的关系。接着, 进行了激光放大器的系统设计, 然后进行实验验证, 最后, 实验还进行了输出激光的性能测试。实验结果表明:在Nd∶YAG晶体棒尺寸为 8 mm×100 mm、Nd3+ 的掺杂浓度为1.1%、泵浦功率最大24 kW、重复频率为10 Hz、泵浦电流为80 A、泵浦脉宽为200 μs的条件下, 得到脉冲宽度10 ns、最大脉冲能量1 050 mJ的脉冲激光, 输出能量不稳定度<3%,通过刀口法测得水平和垂直方向光束质量M2分别是3.9和4.8。满足了高能量、无水冷、稳定可靠等要求。
Abstract
In order to obtain high laser pulse energy, a laser amplifier system was designed. The parameters of the amplifier system are studied such as the output energy, pulse width, energy stability and output pulse width. First, the analysis of the four-level laser rate equation is carried out, and the relations between pump energy, storage energy, and gain coefficient are derived. Then, the system design of the laser amplifier is given, and the experimental verification is carried out. Finally, the performance index of the output laser is tested. Experimental results indicate that, at the size of the Nd∶YAG crystal rod of  8 mm×100 mm, the doping concentration Nd3+ of 1.1%, the pump maximum power of 24 kW, the semiconductor thermoelectric refrigeration with three maximum power of 66 W, the repetition frequency of 10 Hz, the pump current of 80 A, the pump pulse width of 200 μs, we obtained the output of the laser with the maximum pulse energy of 1 050 mJ at a wavelength of 1 064 nm, a pulse width of 10 ns and an output energy instability of 3%. The beam qualities M2 horizontal and vertical directions are 3.9 and 4.8, respectively, through the beam quality diagnostic instrument M-200S. It can satisfy the system requirements of high energy, without water-cooling, stability and reliability.

邹吉跃, 刘学胜, 徐爱东, 王聪聪, 闫岸如, 赵明, 杨松, 刘友强, 王智勇. 大信号无水冷LD侧泵Nd∶YAG激光放大器[J]. 发光学报, 2019, 40(7): 885. ZOU Ji-yue, LIU Xue-sheng, XU Ai-dong, WANG Cong-cong, YAN An-ru, ZHAO ming, YANG Song, LIU You-qiang, WANG Zhi-yong. Large Signal LD Side-pumped Nd∶YAG Laser Amplifier Without Water-cooler[J]. Chinese Journal of Luminescence, 2019, 40(7): 885.

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