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Proceedings Paper

Precision beam pointing control with jitter attenuation by optical deflector exhibiting dynamic hysteresis in COIL
Author(s): Yan-Hua Ma; Zeng-Bao Zhang; Zhi-Guo Zhang; Qin Liu; Xin He; Wen-Bo Shi; Jian-Qin Mao; Yu-Qi Jin
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Paper Abstract

Due to the existence of various disturbances during the lasing process of the chemical oxygen iodine laser (COIL), the optical beam pointing performance is severely degraded. In this paper, an adaptive control methodology is proposed for the precise pointing control of the optical beam with active beam jitter rejection using a giant magnetostrictive optical deflector (GMOD) which exhibits severe dynamic hysteresis nonlinearity. In particular, a least square support vector machine (LS-SVM) based fast compensator is employed to eliminate the dynamic hysteresis without the inverse model construction. Then an improved feedforward adaptive filter is developed to deal with jitter attenuation when the full-coherent reference signal is unavailable. To improve the stability and overall robustness of the controller, especially when a large initial bias exists, a PI controller is placed in parallel with the adaptive filter. Experimental results validate the precise pointing ability of the proposed control method.

Paper Details

Date Published: 3 February 2015
PDF: 9 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92551U (3 February 2015); doi: 10.1117/12.2065104
Show Author Affiliations
Yan-Hua Ma, Dalian Institute of Chemical Physics (China)
Zeng-Bao Zhang, Dalian Institute of Chemical Physics (China)
Zhi-Guo Zhang, Dalian Institute of Chemical Physics (China)
Qin Liu, Dalian Institute of Chemical Physics (China)
Xin He, Dalian Institute of Chemical Physics (China)
Wen-Bo Shi, Dalian Institute of Chemical Physics (China)
Jian-Qin Mao, Beihang Univ. (China)
Yu-Qi Jin, Dalian Institute of Chemical Physics (China)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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