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Phase contrast wavefront sensing for adaptive optics

Show simple item record Bloemhof, E. E. Wallace, J. K. 2011-06-29T22:09:30Z 2011-06-29T22:09:30Z 2004-08-02
dc.identifier.citation SPIE Optical Society and Technology, Denver, Colorado, August 2, 2004. en_US
dc.identifier.clearanceno 04-2443
dc.description.abstract Most ground-based adaptive optics systems use one of a small number of wavefront sensor technologies, notably (for relatively high-order systems) the Shack-Hartmann sensor, which provides local measurements of the phase slope (first derivative) at a number of regularly-spaced points across the telescope pupil. The curvature sensor, with response proportional to the second derivative of the phase, is also sometimes used, but has undesirable noise propagation properties during wavefront reconstruction as the number of actuators becomes large. It is interesting to consider the use for astronomical adaptive optics of the "phase contrast" technique, originally developed for microscopy by Zemike to allow convenient viewing of phase objects. In this technique, the wavefront sensor provides a direct measurement of the local value of phase in each subaperture of the pupil. This approach has some obvious disadvantages compared to Shack-Hartmann wavefront sensing, but has some less obvious but substantial advantages as well. Here we evaluate the relative merits in a practical ground-based adaptive optics system. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004 en_US
dc.subject adaptive optics en_US
dc.subject wavefront sensing en_US
dc.subject phase contrast en_US
dc.title Phase contrast wavefront sensing for adaptive optics en_US
dc.type Preprint en_US

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