Phase locking of a 275 W high power all-fiber amplifier seeded by two categories of multi-tone lasers.
Phase locking of a 275 W high power all-fiber amplifier seeded by two categories of multi-tone lasers.
复制标题
DOI：
10.1364/oe.19.007312
复制
发表时间：
2011-04
期刊：
影响因子：
3.8
通讯作者：
Xiao-lin Wang;J. Leng;P. Zhou;Wenbo Du;H. Xiao;Yanxing Ma;Xiaolin Dong;Xiaojun Xu;Zejin Liu;Yijun Zhao
中科院分区：
文献类型：
--
作者：
Xiao-lin Wang;J. Leng;P. Zhou;Wenbo Du;H. Xiao;Yanxing Ma;Xiaolin Dong;Xiaojun Xu;Zejin Liu;Yijun Zhao
多频辐射是抑制受激布里渊散射（SBS）效应、提高光纤激光器/放大器最终输出功率的一种很有前途的技术。光纤激光器/放大器的相干合束是提高单增益介质输出激光功率同时保持良好光束质量的另一种可行方法。本文将多音驱动全光纤放大器与有源相位补偿相结合，实现了高功率相位锁定相干合成。首先，我们介绍了多频激光相干合成的理论。其次，我们优化了全光纤功率放大器振荡器功率放大器（MOPA）系统的高度可扩展性和灵活性的基础上紧凑，高效率的掺镱光纤放大器链。然后，使用两类多音主振荡器来驱动放大器链。第一类是两个耦合的单频激光器，第二类是调频单频激光器。输出功率都提升到275 W，没有任何明显的SBS。最后，利用随机并行梯度下降（SPGD）算法实现了放大器链的锁相。将此配置扩展到更高的功率涉及增加每个链的功率并增加放大器通道的数量。
Multi-tone radiation is a promising technique to suppress stimulated Brillouin scattering (SBS) effects and improve the ultimate output power of the fiber laser/amplifier. Coherent beam combining of fiber lasers/ amplifiers is another feasible way to increase the output laser power from single gain medium while simultaneously maintaining good beam quality. In this paper, we combine the multi-tone driven all-fiber amplifiers and active phase compensation to demonstrate high power phase locking for coherent beam combining. First, we present the theory of coherent beam combining of multi-tone lasers. Second, we optimize the all-fiber power amplifier oscillator power-amplifier (MOPA) system with high scalability and flexibility based on compact, high efficiency Yb-doped fiber amplifier chains. Then, two categories of multi-tone master oscillators are used to driven the amplifier chains. The first category is two coupled single-frequency lasers and the second is a frequency modulated single-frequency laser. The output powers are all boosted to 275 W without any distinct SBS. Last, phase locking of the amplifier chains are implemented using stochastic parallel gradient descent (SPGD) algorithm. Scaling this configuration to a higher power involves increasing the power per chain and adding the number of amplifier channels.