This correspondence demonstrates a closed-form, linearized solution of the general N-element adaptive optics system in terms of the feedback parameters of the separate control loops. It is shown that the stability of the Nth-order loop is nearly identical with that of the separate (decoupled) loops.
© 1977 Optical Society of America
T. R. O’Meara, "Stability of an N-loop ensemble-reference phase control system," J. Opt. Soc. Am. 67, 315-318 (1977)