中国激光, 2010, 37 (12): 2949, 网络出版: 2014-03-12   

带固体相位共轭镜的全固态脉冲抽运高重复频率大能量单纵模MOPA激光器 下载: 505次

All-Solid-State High Pulse Repetition Rate High Pulse Energy Single-Longitudinal-Mode MOPA Laser System with Solid-State Phase Conjugating Mirror
作者单位
1 浙江大学现代光学仪器国家重点实验室, 浙江 杭州 310027
2 中国工程物理研究院应用电子技术研究所, 四川 绵阳 621900
摘要
使用脉冲激光二极管抽运的单纵模激光器作为种子源,通过两级预放大器和两级主放大器的单通放大,得到重复频率400 Hz,单脉冲能量36.5 mJ,脉宽24 ns的单纵模激光输出,且输出光束质量为M2x=1.78,M2y=2.13。应用大口径锥度融石英光纤作为相位共轭镜,获得了大于50%的受激布里渊散射反射率,入射激光被压缩到6 ns左右,大幅提升了脉冲峰值功率;由于相位共轭特性,反射回的激光将沿原路返回再次通过主放大器,补偿了激光晶体中的相位畸变,并再次提取晶体中的能量进行有效放大。双通后输出重复频率400 Hz,单脉冲能量101.25 mJ,脉冲宽度6 ns左右的单纵模激光,峰值功率可高达16.8 MW,光束质量因子为M2x=1.74, M2y=1.93。可见,在应用该相位共轭镜双通过后,光束质量并没有继续恶化,而是有所提升;使用平面镜双通后的光束质量因子M2≈4,从而有效证实了该光纤相位共轭镜补偿畸变的作用。
Abstract
The output laser beam from a pulsed diodes side pumped single longitudinal mode laser is amplified by single passing through two pre-amplifiers and two main amplifiers, by which single longitudinal mode laser with pulse energy of 36.5 mJ, pulse width of 24 ns at 400 Hz repetition rate is obtained, with beam quality factor being M2x=1.78, M2y=2.13. After applying a large aperture tapered fused silica fiber as phase conjugating mirror, which shows more than 50% stimulated Brillouin scattering reflectivity, the input laser pulse width can be reduced to 6 ns and peak power increased significantly. The returned laser backtracks because of the phase conjugation characteristics and passes through two main amplifiers again, not only compensating the phase aberration of the laser amplifier crystal but also distilling more energy and amplifying the laser effectively. Finally, single longitudinal mode laser with pulse energy of 101.25 mJ, pulse width of 6 ns at 400 Hz repetition rate is achieved, corresponding to a peak power of 16.8 MW. Its beam quality factor is M2x=1.74, M2y=1.93. Obviously, the beam quality is improved instead of deteriorated after applying the phase conjugation mirror. However, the beam quality deteriorates to M2≈4 by using plane high reflective (HR) mirror, which validates the effectiveness of the phase conjugation mirror.

赵智刚, 崔玲玲, 童立新, 高清松, 唐淳, 刘崇, 陈军. 带固体相位共轭镜的全固态脉冲抽运高重复频率大能量单纵模MOPA激光器[J]. 中国激光, 2010, 37(12): 2949. Zhao Zhigang, Cui Lingling, Tong Lixin, Gao Qingsong, Tang Chun, Liu Chong, Chen Jun. All-Solid-State High Pulse Repetition Rate High Pulse Energy Single-Longitudinal-Mode MOPA Laser System with Solid-State Phase Conjugating Mirror[J]. Chinese Journal of Lasers, 2010, 37(12): 2949.

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