摘要
主动相位控制的光纤激光阵列相干合成在提高输出功率的同时能够保证良好的光束质量,其关键技术在于光纤激光相干阵列的锁相控制。基于随机并行梯度下降(SPGD)算法的锁相控制方案不仅具有控制策略简单、系统结构紧凑的优点,而且通过算法性能评价函数和迭代参数的选取,能够对光纤激光相干阵列进行多种锁相控制,从而得到各种形式的阵列合成光束输出,实现与自适应光子锁相元件整列(APPLE)系统阵列的有效契合。理论研究并实验实现了基于SPGD算法的相位控制方案的同相相干合成锁相控制、合成光束主极大偏转控制和空心光束产生等功能,验证了基于SPGD算法的全电光束控制在各种形态光束控制中的可行性。
Active phasing coherent beam combination of fiber laser array is an efficient way to scale high power laser while holding good beam quality simultaneously.The key technique of active phasing coherent beam combining system is active phase-locking control of the coherent fiber laser array.Active phase-locking using stochastic parallel gradient descent（SPGD） algorithm holds the advantage of easy strategy and compact bulk.Furthermore,by choosing appropriate metric function and iteration parameter,special phase control state of the system can be realized and corresponding multiform coherent combined laser beams can be achieved,which are agree with the requirement of adaptive photonics phase-locked element（APPLE） array system.With SPGD algorithm-based active phase-locking system,in-phase phase locking of coherent beam combination,beam steering of the main lobe of combined laser beams,generation of dark-hollow beam are analyzed theoretically and demonstrated experimentally,and the feasibility of multiform beam control of coherent fiber laser array using SPGD algorithm is validated.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第10期2874-2878,共5页
Acta Optica Sinica
基金
国防科学技术大学优秀研究生创新项目(B080702)资助课题
关键词
光纤光学
锁相控制
随机并行梯度下降(SPGD)算法
相干合成
光束偏转
空心光束
fiber optics
phase-locking control
stochastic parallel gradient descent（SPGD） algorithm
coherent beam combining
beam steering
dark-hollow beam
