Simultaneous detection of beam pointing and optical phase errors for multiple beams using a quadrant photo detector for high-efficiency coherent beam combining systems

摘要

In this letter, we propose and demonstrate a technique, based on radio frequency demodulation, for coherent beam combining (CBC) systems to simultaneously detect beam pointing and optical phase errors for multiple beams using a quadrant photo detector. The standard deviation of the detection accuracy of the beam pointing error was 0.19 mu rad, and that of the residual optical phase error, at the time of optical phase locking, was 0.7 degrees, yielding a high combining efficiency of 99%. This technique has the potential to increase beam combination to over 100 elements and offer efficient and highly scalable CBC systems. (C) 2019 The Japan Society of Applied Physics