Wj. Wild et al., SPARSE-MATRIX WAVE-FRONT ESTIMATORS FOR ADAPTIVE-OPTICS SYSTEMS FOR LARGE GROUND-BASED TELESCOPES, Optics letters, 20(9), 1995, pp. 955-957
A closed-loop adaptive-optics servo system is an iterative optical-dig
ital processor that can be characterized by a first-order difference e
quation. This identification leads to a new class of wave-front estima
tors, some of which are extremely sparse and permit real-time subapert
ure intensity weighting.