Wavefront control toolbox for James Webb Space Telescope testbed

Ron Shiri; David L. Aronstein; Jeffery S. Smith; Bruce H. Dean; Erin M. Sabatke

doi:10.1117/12.736314

1 November 2007 Wavefront control toolbox for James Webb Space Telescope testbed

Ron Shiri, David L. Aronstein, Jeffery S. Smith, Bruce H. Dean, Erin M. Sabatke

Proceedings Volume 6711, Advanced Wavefront Control: Methods, Devices, and Applications V; 67110P (2007) https://doi.org/10.1117/12.736314
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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.

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Ron Shiri, David L. Aronstein, Jeffery S. Smith, Bruce H. Dean, and Erin M. Sabatke "Wavefront control toolbox for James Webb Space Telescope testbed", Proc. SPIE 6711, Advanced Wavefront Control: Methods, Devices, and Applications V, 67110P (1 November 2007); https://doi.org/10.1117/12.736314

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KEYWORDS

Mirrors

James Webb Space Telescope

Wavefronts

Image segmentation

Control systems

Detection and tracking algorithms

Telescopes

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