1 September 2006 Adaptive control of jitter in laser beam pointing and tracking
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This paper presents new results on adaptive control of jitter in laser beams. Experimental results illustrate the capability of a recently developed method for variable-order adaptive control reduce jitter in bandwidths well beyond the bandwidth of linear time invariant control systems. The adaptive control loop is based on recursive least squares lattice filter that implicitly identifies the disturbance statistics from real-time sensor data. The adaptive controller achieves both fast adaptation and true minimum variance steady state performance. The main innovation in this paper is frequency weighting in the adaptive control loop to emphasize the relative importance of jitter in particular bandwidths and mitigate the effects of high-frequency sensor noise. Results from an experiment with a MEMS fast steering mirror used in current free space optical communications systems illustrate suppression of jitter with simultaneous multiple bandwidths produced by multiple jitter sources.
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Néstor O. Pérez Arancibia, Néstor O. Pérez Arancibia, Neil Chen, Neil Chen, Steve Gibson, Steve Gibson, Tsu-Chin Tsao, Tsu-Chin Tsao, "Adaptive control of jitter in laser beam pointing and tracking", Proc. SPIE 6304, Free-Space Laser Communications VI, 63041G (1 September 2006); doi: 10.1117/12.681302; https://doi.org/10.1117/12.681302

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