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Proceedings Paper

Closed-loop wave-front correction using phase diversity
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Paper Abstract

Closed loop wave front correction of low order Zernike polynomials has been demonstrated using a phase diversity wavefront sensor. The Lockheed-Martin Advanced Technology Center phase diversity brassboard was used to demonstrate low bandwidth correction of aberrations consisting of the Zernike polynomials describing focus, coma and spherical. The method of Lofdahl-Scharmer is used to estimate and correct fixed aberrations in an optical system. The General Regression Neural Network method is used to estimate slowly varying aberrations in the same optical system. Closed loop experimental results from these tests are presented.

Paper Details

Date Published: 28 August 1998
PDF: 10 pages
Proc. SPIE 3356, Space Telescopes and Instruments V, (28 August 1998); doi: 10.1117/12.324439
Show Author Affiliations
Rick Lee Kendrick, Lockheed Martin Advanced Technology Ctr. (United States)
Raymond M. Bell, Lockheed Martin Advanced Technology Ctr. (United States)
Alan L. Duncan, Lockheed Martin Advanced Technology Ctr. (United States)
Gordon D. Love, Univ. of Durham (United Kingdom)
D. Scott Acton, W.M. Keck Observatory (United States)


Published in SPIE Proceedings Vol. 3356:
Space Telescopes and Instruments V
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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