A closed-loop adaptive-optics servo system is an iterative optical-digital processor that can be characterized by a first-order difference equation. This identification leads to a new class of wave-front estimators, some of which are extremely sparse and permit real-time subaperture intensity weighting.
© 1995 Optical Society of America
Walter J. Wild, Edward J. Kibblewhite, and Rodolphe Vuilleumier, "Sparse matrix wave-front estimators for adaptive-optics systems for large ground-based telescopes," Opt. Lett. 20, 955-957 (1995)