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Proceedings Paper

Wavefront control toolbox for James Webb Space Telescope testbed
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Paper Abstract

A MATLAB toolbox has been developed for wavefront control of segmented optical systems. The toolbox is applied to the optical models of the James Webb Space Telescope (JWST) in general and to the JWST Testbed Telescope (TBT) in particular, implementing both unconstrained and constrained wavefront optimization to correct for possible misalignments of the segmented primary mirror or the monolithic secondary mirror. The optical models are implemented in the ZEMAX optical design program and information is exchanged between MATLAB and ZEMAX via the Dynamic Data Exchange (DDE) interface. The model configuration is managed using the Extensible Markup Language (XML) protocol. The optimization algorithm uses influence functions for each adjustable degree of freedom of the optical model. Both iterative and non-iterative algorithms have been developed that converge to a local minimum of the root-mean-square (rms) wavefront error using singular value decomposition (SVD) of the control matrix of influence functions. The toolkit is highly modular and allows the user to choose control strategies for the degrees-of-freedom (DOF) on a given iteration and also allows the wavefront convergence criterion to be checked on each iteration. As the influence functions are nonlinear over the full control parameter space, the toolkit also allows for trade-offs between frequency of updating the local influence functions and execution speed. The functionality of the toolbox and the validity of the underlying algorithms have been verified through extensive simulations.

Paper Details

Date Published: 1 November 2007
PDF: 10 pages
Proc. SPIE 6711, Advanced Wavefront Control: Methods, Devices, and Applications V, 67110P (1 November 2007); doi: 10.1117/12.736314
Show Author Affiliations
Ron Shiri, NASA Goddard Space Flight Ctr. (United States)
David L. Aronstein, NASA Goddard Space Flight Ctr. (United States)
Jeffery S. Smith, NASA Goddard Space Flight Ctr. (United States)
Bruce H. Dean, NASA Goddard Space Flight Ctr. (United States)
Erin M. Sabatke, Ball Aerospace and Technologies Corp. (United States)

Published in SPIE Proceedings Vol. 6711:
Advanced Wavefront Control: Methods, Devices, and Applications V
Richard A. Carreras; John D. Gonglewski; Troy A. Rhoadarmer, Editor(s)

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