光纤激光共孔径光谱合成实现5 kW高效优质输出

马毅; 颜宏; 田飞; 孙殷宏; 赵磊; 王树峰; 谢庚承; 李腾龙; 王小军; 梁小宝; 王岩山; 冉欢欢; 彭万敬; 柯伟伟; 冯昱骏; 唐淳; 张凯; 高清松

doi:10.11884/HPLPB201527.040101

光纤激光共孔径光谱合成实现5 kW高效优质输出

doi: 10.11884/HPLPB201527.040101

马毅^1,2, ,,
颜宏^1,2,
田飞^1,2,
孙殷宏^1,2,
赵磊³,
王树峰^1,2,
谢庚承^1,2,
李腾龙^1,2,
王小军^2,4,
梁小宝³,
王岩山^1,2,
冉欢欢¹,
彭万敬^1,2,
柯伟伟^2,4,
冯昱骏⁵,
唐淳^1,2,
张凯^1,2,
高清松^1,2

1.
中国工程物理研究院应用电子学研究所, 四川绵阳 621 900;
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 621 900;
3.
中国工程物理研究院激光聚变研究中心, 四川绵阳 621 900;
4.
北京应用物理与计算数学研究所, 北京 1 00088;
5.
清华大学工程物理系, 北京 1 00084

详细信息

通讯作者:
马毅

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出版历程
- 收稿日期: 2015-03-12
- 修回日期: 2015-03-16
- 刊出日期: 2015-03-23

Common aperture spectral beam combination of fiber lasers with 5 kW power high-efficiency and high-quality output

1.
Institute of Applied Electronics,CAEP,Mianyang 621900,China;
2.
The Key Laboratory of Science and Technology on High Energy Laser,CAEP,Mianyang 621900,China;
3.
Research Center of Laser Fusion,CAEP,Mianyang 621900,China;
4.
Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;
5.
Department of Engineering Physics,Tsinghua University,Beijing 100084,China

摘要

摘要: 采用多层介质膜衍射光栅实现多路高功率光纤激光共孔径光谱合成有望成为光纤激光同时实现高功率、高效率和高光束质量的最具发展潜力的技术途径。搭建了一套基于双光栅色散补偿设计的5 kW共孔径光谱合成系统。采用国产多层介质膜衍射光栅实现了5路kW级窄谱子束激光的高效优质共孔径光谱合成,最大输出功率达5.07 kW,光束质量因子(M2)小于3,合成效率达到91.2%。初步研究表明：多层介质膜衍射光栅在较高功率水平、较宽光谱范围内均能保持较高衍射效率,是实现高功率光纤激光高效率光谱合成的重要器件；参与合成的子束自身的光束质量水平和线宽是影响合成输出光束质量的重要因素,光谱合成系统的输出功率主要受限于窄谱子束的输出功率和合成路数,增加窄谱子束的功率或合成路数均可进一步提升系统的输出功率。
- 光纤激光 /
- 多层介质膜光栅 /
- 共孔径 /
- 光谱合成
Abstract: Common Aperture Spectral Beam Combination (SBC) of multiple high power fiber lasers output into a composite beam via a multi-layer dielectric (MLD) gratingis a promising approach for the fiber laser system to scale the output power further while maintaining high efficiency and excellent beam quality simultaneously. A common aperture SBC system with dual-grating dispersion compensation configuration based on five kW-level narrow-linewidth fiber amplifier chains in all-fiber format is set up. A common aperture combing beam is achieved with high efficiency and excellent beam quality in the system by using China-made MLD gratings. The maximum average output power of 5.07 kW of the combined beam and the combination efficiency of 91.2% are obtained. The beam quality factor M2 at a power level of 5 kW is less than 3. The preliminary experimental results have shown that MLD grating, which can maintain high diffraction efficiency in a wide spectrum range under high power level operation, is a perfect element for SBC of high power fiber laser. The results also demonstrate that the beam quality and the linewidth of the individual fiber laser are the key factors affecting the beam quality of the spectral combining beam. Presently, the output power is limited by the amount of the narrow-linewidth fiber amplifier chains and the output power of the individual narrow-linewidth fiber amplifier. So it can be expected that the common aperture SBC system output power can be further scaled.
- fiber laser /
- multi-layer dielectric grating /
- common aperture /
- spectral beam combining