光阵列相干合成相位误差的探测与自适应校正研究

介绍了一种用于探测和校正激光阵列相位噪声的新方法。新方法基于探测光强极值算法（DBPIP)，既能用于平移相位差（Piston)的探测也能用于倾斜相位差(Tilt)的探测。从理论上分析了新方法的原理，并搭建了基于能动分块反射镜的两路激光阵列相干合成实验系统加以验证。结果表明，闭环后平移相位差的均方根（RMS）值可控制在λ/19以内，光束倾斜范围控制在25 μrad（约0.5倍衍射极限角）以内。实验验证了新方法用于探测平移相位差和倾斜相位差的有效性，而且新方法能满足相干合成所要求的控制精度。

Abstract

A new method to detect and correct the phase errors of laser arrays is presented. This method, based on finding the brightest point of the diffraction pattern, can be used to detect both piston errors and tilt errors. The principle of this method is described theoretically. A system combining two laser beam arrays is built based on active segmented mirrors to testify the efficiency of the method. The experimental results show that the root-mean-square (RMS) value of the piston errors can be controlled in λ/19 and the tilt errors can be controlled in 25 μrad (0.5 times of the diffraction limit). The experiments prove that the new method can be used to detect the phase errors in coherent beam combing of laser arrays.

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王晓华, 郑轶, 沈锋, 饶长辉. 光阵列相干合成相位误差的探测与自适应校正研究[J]. 激光与光电子学进展, 2012, 49(2): 021401. Wang Xiaohua, Zheng Yi, Shen Feng, Rao Changhui. Research on Detection and Adaptive Correction of Phase Errors for Coherent Combining Laser Arrays[J]. Laser & Optoelectronics Progress, 2012, 49(2): 021401.

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