Curvature Wavefront Sensor For Solar Adaptive Optics |
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| Authors: | Molodij G Roddier F Kupke R Mickey DL |
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| Institution: | (1) U.P.S, 853, Via Lactea, La Laguna, 38200 Tenerife, Spain;(2) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Dr., Honolulu, HI, 96822, U.S.A |
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| Abstract: | Active or adaptive optics often require the ability to characterize wavefront aberrations using natural extended sources.
The task becomes especially challenging when dealing with widely extended sources such as the solar granulation. We propose
a new approach based on the processing of oppositely defocused images. This method, which is a generalization of a technique
known as curvature sensing, derives the wavefront curvature from the difference between two oppositely defocused images and
determines the second momenta of the point spread function. The proposed method measures the wavefront aberration from the
images themselves, requires little computational resources, is fast enough to be used in a real-time adaptive optics system
and is particularly adapted to random patterns such as solar granulation or spot penumbras whose morphology evolves during
the observation. We envision the application of the method to real-time seeing compensation in solar astronomical telescopes,
and to the correction of optical system aberrations in remote sensing instrumentation. This effort is directed towards building
a curvature sensor for the real-time applications. |
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