Modal control for wavefront reconstruction in adaptive optics

Details Modal control for wavefront reconstruction in adaptive optics Modal control for wavefront reconstruction in adaptive optics

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..332..269b&link_type=abstract

IN: International Conference on Advanced Technology Optical Telescopes, Tucson, AZ, March 11-13, 1982, Proceedings (A83-30976 13

Physics

Optics

Adaptive Control, Adaptive Optics, Atmospheric Optics, Telescopes, Wave Front Reconstruction, Aberration, Mirrors

Scientific paper

In adaptive optics, the compensating phase distribution can be generated by an expansion of the turbulence phase distortions into modes of a set of basic functions, i.e. Zernike-polynomials and Karhunen-Loeve-functions. By applying a modal control concept to a practical adaptive optical system, the electrodes of a membrane mirror can be controlled in parallel with greatly reduced cross-talk. The coefficients of the approximating functions, each of which corresponds to a certain mode of the mirror surface, are fed back to the actuators by a modal control matrix. The atmospheric turbulences are taken into account by extending the local differential operator in an 'observer'-like structure.

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