Ms. Lixia Zhang Profile

Lixia Zhang

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Proceedings Article | 15 October 2012 Paper

Compensation method for random drifts of laser beams based on moving average feedback control

Lixia Zhang, Ruilin Wang, Wumei Lin, Zhijie Liao

Proceedings Volume 8417, 84170Q (2012) https://doi.org/10.1117/12.963472

KEYWORDS: Feedback control, Mirrors, Beam delivery, Optical simulations, Control systems, Computer simulations, Beam controllers, Algorithms, Process control, Sensors

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In order to eliminate the measurement errors caused by the instability of laser beams, a real-time compensation algorithms for the random drifts of laser beams based on moving average (MA) correction mechanism was presented. By establishing a correction model with two fast steering mirrors in the beam delivery path and analyzing the pulse to pulse beam fluctuation, a real-time beam drifts correction is implemented based on closed loop feedback control, which especially focuses on reducing the pulse to pulse drifts and ground fluctuations. The simulation results show that this algorithm can control beam drifts effectively. Optimal MA can be reduced to 3n^-1/2 times (n--pulse numbers in a window) without the ground vibrations. There are a series of improvements on the moving standard deviation (MSD) as well. MSD get a sudden decline at the window pulse. Meanwhile, the drifts can be restrained while loading the ground vibrations without any big jump, and the dropping amplitude is bigger than without the ground vibration. MSD drop while the whole system is controlled by this compensation method and the results are stable. The key of this compensation method for random drifts of laser beams based on moving average feedback control lies in the appropriate corrections formula. What is more, this algorithm which is practical can achieve high precision control of direction drifts.

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