We conducted a study to explore a real-time monitoring variable of a coherently combined beam returned from a scattering target. The effect of a spatial filtering on the speckle pattern generated from the interference of the scattered beam was examined in a coherent beam combining (CBC) system, including three-channel laser output, the scattering target, and receiver optics in free space. We were able to recognize the arrangement of the original beams from the speckle pattern by applying a proper spatial filter with a size of 2 mm. The power-in-the-bucket value in the monitoring system was also investigated as a function of the spatial filter size. Our research implies that a complex speckle pattern can be analyzed using spatial filtering to derive a single-output real-time variable in the CBC monitoring system.

我们进行了一项研究，以探索从散射目标返回的相干组合光束的实时监控变量。在相干光束合并（CBC）系统（包括三通道激光输出，散射目标和自由空间中的接收器光学系统）中，检查了空间滤波对由散射光束的干扰产生的斑点图案的影响。通过应用大小为2 mm的适当空间滤波器，我们能够从斑点图案中识别出原始光束的排列。监视系统中的“桶中功率”值也作为空间滤波器大小的函数进行了研究。我们的研究表明，可以使用空间滤波来分析复杂的斑点图案，从而在CBC监视系统中得出单输出实时变量。