Phase retrieval algorithm for JWST Flight and Testbed Telescope

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Title:		Phase retrieval algorithm for JWST Flight and Testbed Telescope
Authors:		Dean, Bruce H.; Aronstein, David L.; Smith, J. Scott; Shiri, Ron; Acton, D. Scott
Affiliation:		AA(NASA Goddard Space Flight Ctr. (USA)), AB(NASA Goddard Space Flight Ctr. (USA)), AC(NASA Goddard Space Flight Ctr. (USA)), AD(NASA Goddard Space Flight Ctr. (USA)), AE(Ball Aerospace and Technologies Corp. (USA))
Publication:		Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter. Edited by Mather, John C.; MacEwen, Howard A.; de Graauw, Mattheus W. M.. Proceedings of the SPIE, Volume 6265, pp. 626511 (2006). (SPIE Homepage)
Publication Date:		07/2006
Origin:		SPIE
Abstract Copyright:		(c) 2006: SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
DOI:		10.1117/12.673569
Bibliographic Code:		2006SPIE.6265E..31D

Abstract

An image-based wavefront sensing and control algorithm for the James Webb Space Telescope (JWST) is presented. The algorithm heritage is discussed in addition to implications for algorithm performance dictated by NASA's Technology Readiness Level (TRL) 6. The algorithm uses feedback through an adaptive diversity function to avoid the need for phase-unwrapping post-processing steps. Algorithm results are demonstrated using JWST Testbed Telescope (TBT) commissioning data and the accuracy is assessed by comparison with interferometer results on a multi-wave phase aberration. Strategies for minimizing aliasing artifacts in the recovered phase are presented and orthogonal basis functions are implemented for representing wavefronts in irregular hexagonal apertures. Algorithm implementation on a parallel cluster of high-speed digital signal processors (DSPs) is also discussed.

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