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

Lixia Zhang; Ruilin Wang; Wumei Lin; Zhijie Liao

doi:10.1117/12.963472

15 October 2012 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, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 84170Q (2012) https://doi.org/10.1117/12.963472
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

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.

Citation Download Citation

Lixia Zhang, Ruilin Wang, Wumei Lin, and Zhijie Liao "Compensation method for random drifts of laser beams based on moving average feedback control", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84170Q (15 October 2012); https://doi.org/10.1117/12.963472

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KEYWORDS

Feedback control

Mirrors

Beam delivery

Optical simulations

Control systems

Algorithms

Beam controllers

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