Jiang Min, Su Rongtao, Zhang Zhixin, Ma Yanxing, Wang Xiaolin, Zhou Pu
Appl Opt. 2017 May 20;56(15):4255-4260. doi: 10.1364/AO.56.004255.
Coherent beam combination (CBC) is a promising method to obtain high-power and high-brightness laser output. In this paper, we present a novel single-frequency dithering technique based on code division multiple access (CDMA). By using orthogonal phase control signals, the number of channels can be increased and the phase control speed in the coherent beam combination system can be boosted. The design method and coding expression of orthogonal signals, as well as the relevant simulations and experiments of the designed signals, have been demonstrated. In the experiment, we design four orthogonal signals and realize the phase locking of five channels. When the phase control system is in the closed loop, the residual phase error is less than λ/30 and the phase control speed of the CBC system is increased to nearly eleven times compared with that of the single-frequency dithering technique.
相干光束合成（CBC）是一种获得高功率和高亮度激光输出的有前景的方法。在本文中，我们提出了一种基于码分多址（CDMA）的新型单频抖动技术。通过使用正交相位控制信号，可以增加通道数量并提高相干光束合成系统中的相位控制速度。已经展示了正交信号的设计方法和编码表达式，以及所设计信号的相关仿真和实验。在实验中，我们设计了四个正交信号并实现了五通道的锁相。当相位控制系统处于闭环时，残余相位误差小于λ/30，并且与单频抖动技术相比，CBC系统的相位控制速度提高到近11倍。
