红外与激光工程, 2018, 47 (11): 1105003, 网络出版: 2019-01-10  

VRM腔高光束质量高功率双波长激光器

High beam quality and high power dual-wavelength laser with VRM
靳全伟 1,2,3,*庞毓 1,2蒋建锋 1,2谭亮 2崔玲玲 1,2魏彬 1,2万敏 1,2高清松 1,2唐淳 1,2
作者单位
1 中国工程物理研究院应用电子学研究所, 四川 绵阳 621999
2 中国工程物理研究院高能激光科学与技术重点实验室, 四川 绵阳 621999
3 中国工程物理研究院 北京研究生部, 北京 100088
摘要
研制的双波长短脉冲激光器采用“大模体积腔+渐变反射率输出镜”技术, 对二极管泵浦棒状激光介质产生的热透镜及热退偏进行补偿, 在500 Hz下实现了谐振腔短脉冲能量140 mJ, 脉宽约17.76 ns的1 064 nm激光输出, 20 min能量不稳定性RMS值小于0.3%, 激光光束质量M2≈1.6。该实验结果与采用MOPA技术路线——谐振腔+预放的方式技术指标相当, 但采用谐振腔的技术路线结构简单紧凑。采用水热法生长抗灰迹效应的GTR-KTP晶体作为倍频晶体, 相位匹配方式选择II类相位匹配, 倍频后532 nm激光单脉冲最高能量96 mJ, 最高倍频效率68.6%, 激光光束质量M2≈2.1。通过能量调节设计, 实现了线偏振态1 064 nm和532 nm激光功率连续可调共光轴输出。
Abstract
The double wavelenghs short pulse laser was developed with the high mode volume and variable reflectivity mirror(VRM). The thermal lens and the thermal birefringence produced by diode-lasers pumped rod laser medium was compensated, which presented a short-pulse energy of 140 mJ and 1 064 nm laser output with a pulse width of 17.76 ns at a repetition rate of 500 Hz. The beam quality value was M2≈1.6, and the energy instability(RMS) value of 20 minutes was less than 0.3%. The result of resonator was corresponded with Master Oscillator Power-Amplifier(MOPA) technology, but it was close and neat. The maximum laser energy of 96 mJ at 532 nm was demonstrated by extra-cavity second-harmonic generation(SHG) with type-II angle phase-matched GTR-KTP crystal, the KTP crystals with resistance to grey trace effect was grown by hydrothermal method. The maximum efficiency of SHG was 68.6%, and the beam quality value was M2≈2.1. The 1 064 nm and 532 nm laser were output at same axis with energy regulation.

靳全伟, 庞毓, 蒋建锋, 谭亮, 崔玲玲, 魏彬, 万敏, 高清松, 唐淳. VRM腔高光束质量高功率双波长激光器[J]. 红外与激光工程, 2018, 47(11): 1105003. Jin Quanwei, Pang Yu, Jiang Jianfeng, Tan Liang, Cui Lingling, Wei Bing, Wan Min, Gao Qingsong, Tang Chun. High beam quality and high power dual-wavelength laser with VRM[J]. Infrared and Laser Engineering, 2018, 47(11): 1105003.

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