3 February 2015 Precision beam pointing control with jitter attenuation by optical deflector exhibiting dynamic hysteresis in COIL
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Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92551U (2015) https://doi.org/10.1117/12.2065104
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China
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.
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Yan-Hua Ma, Zeng-Bao Zhang, Zhi-Guo Zhang, Qin Liu, Xin He, Wen-Bo Shi, Jian-Qin Mao, Yu-Qi Jin, "Precision beam pointing control with jitter attenuation by optical deflector exhibiting dynamic hysteresis in COIL", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92551U (3 February 2015); doi: 10.1117/12.2065104; https://doi.org/10.1117/12.2065104
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