中国激光, 2015, 42 (11): 1102003, 网络出版: 2022-09-24
倾斜相差对大阵列光纤相干合成的影响与分析
Analysis of Influence of Tip/Tilt Phase Error on a Large Scale Coherent Beam Combination of Fiber Laser
摘要
根据夫琅禾费衍射理论,建立了7路和37路光纤激光相干光束合成(CBC)模型,仿真模拟了不同占空比、不同倾斜角度情况下,合成光束在远场的强度分布和光束质量,分析了倾斜角度、占空比以及合成路数对CBC 远场光束质量的影响。仿真结果表明: 随着子光束倾斜角度的增大,远场艾里斑内的光强逐渐减小,合成效果变差;随着合成子束的增多,远场桶中功率(PIB)随倾斜角度的增大下降加快,显示出了倾斜相差随合成路数增加具有一定的累积效应,要提高相干合成的效果,必须同时控制倾斜相差和活塞相差。
Abstract
A model of coherent beam combination (CBC) of fiber laser with 7-channel and 37-channel is establishedaccording to Fraunhofer diffraction theory. The far-field intensity distribution and beam quality of coherent beamcombination with different duty ratios and tilt angles are simulated. The influences of tip/tilt phase error, duty ratioand the number of sub-beams on CBC of far field beam quality are analyzed. Simulation results show that the farfield intensity in the Airy disk decreases with increasing tilt angle, which means degraded combination effect. Thepower in the bucket (PIB) of the far field decreases more rapidly with tilt angle increased in a large- scalecombination, which means that the accumulated effect of tip/tilt phase error with the number increase of sub-beamscan appear. In order to improve the efficiency of CBC, the tip/tilt phase error and piston phase error should becontrolled simultaneously.
黄智蒙, 唐选, 刘仓理, 李剑峰, 张大勇, 王小军, 韩梅. 倾斜相差对大阵列光纤相干合成的影响与分析[J]. 中国激光, 2015, 42(11): 1102003. Huang Zhimeng, Tang Xuan, Liu Cangli, Li Jianfeng, Zhang Dayong, Wang Xiaojun, Han Mei. Analysis of Influence of Tip/Tilt Phase Error on a Large Scale Coherent Beam Combination of Fiber Laser[J]. Chinese Journal of Lasers, 2015, 42(11): 1102003.