Phase retrieval analysis of the Hobby-Eberly Telescope primary mirror segment figure error and its implication for wavefront sensing for the new wide-field upgrade

Hanshin Lee; Gary J. Hill; Michael Hart

doi:10.1117/12.857129

5 August 2010 Phase retrieval analysis of the Hobby-Eberly Telescope primary mirror segment figure error and its implication for wavefront sensing for the new wide-field upgrade

Hanshin Lee, Gary J. Hill, Michael Hart

Author Affiliations +

Proceedings Volume 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV; 77381K (2010) https://doi.org/10.1117/12.857129
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

Primary mirror segment figure error is potentially deleterious to the wavefront sensing in the new Hobby-Eberly Telescope (HET) Wide-Field Upgrade (WFU). Previous measurements indicated the presence of figure errors including prominent surface astigmatism on the segments, but need a systematic analysis to quantify the amounts. We developed a Phase Retrieval procedure that estimates the surface figure map by applying the iterative transform method to a set of focus-diversed images of a point source formed by the 91 segments of the 11m HET primary mirror. In this paper, we discuss this analysis and the implication of the analysis results for wavefront sensing on the upgraded HET.

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Hanshin Lee, Gary J. Hill, and Michael Hart "Phase retrieval analysis of the Hobby-Eberly Telescope primary mirror segment figure error and its implication for wavefront sensing for the new wide-field upgrade", Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77381K (5 August 2010); https://doi.org/10.1117/12.857129

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