论文标题
低重复频率的脉冲光相干组合的窗口过滤算法
Window Filtering Algorithm for Pulsed Light Coherent Combining of Low Repetition Frequency
论文作者
论文摘要
在极化相干组合实验的相位锁定中，多饮用方法已经得到很好的验证。但是，由于脉冲激光器和振幅相位噪声和传统过滤器之间存在重叠的频域，因此很难应用于低重复频率脉冲激光器，无法有效地分开相位噪声。为了解决本文中的问题，我们提出了一种基于噪声信号之间的自相关特性的新型脉冲噪声检测，识别和过滤方法。在提出的算法中，使用自设计的窗口算法来识别脉冲，然后用插值替换窗口中的脉冲信号基团，该脉冲基团被插值替换，该算法有效地过滤了0.1 ms内相位噪声中掺杂的脉冲信号。过滤相噪声中的脉冲后，在1 ms中成功补偿了两个脉冲梁（10 kHz）的相位差，并实现了闭环相位锁的相干组合。同时，相位校正时间很少，相位锁定效应稳定，最终的光强度增加到理想值（0.9 IMAX）。
The multi-dithering method has been well verified in phase locking of polarization coherent combination experiment. However, it is hard to apply to low repetition frequency pulsed lasers, since there exists an overlap frequency domain between pulse laser and the amplitude phase noise and traditional filters cannot effectively separate phase noise. Aiming to solve the problem in this paper, we propose a novel method of pulse noise detection, identification, and filtering based on the autocorrelation characteristics between noise signals. In the proposed algorithm, a self-designed window algorithm is used to identify the pulse, and then the pulse signal group in the window is replaced by interpolation, which effectively filter the pulse signal doped in the phase noise within 0.1 ms. After filtering the pulses in the phase noise, the phase difference of two pulsed beams (10 kHz) is successfully compensated to zero in 1 ms, and the coherent combination of closed-loop phase lock is realized. At the same time, the phase correction times are few, the phase lock effect is stable, and the final light intensity increases to the ideal value (0.9 Imax).
