Special Section on WFIRST-AFTA Coronagraphs

Low-order wavefront sensing and control for WFIRST-AFTA coronagraph

[+] Author Affiliations
Fang Shi, Kunjithapatham Balasubramanian, Randall Hein, Raymond Lam, Douglas Moore, James Moore, Keith Patterson, Ilya Poberezhskiy, Joel Shields, Erkin Sidick, Hong Tang, Tuan Truong, J. Kent Wallace, Xu Wang, Daniel Wilson

Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91009, United States

J. Astron. Telesc. Instrum. Syst. 2(1), 011021 (Mar 15, 2016). doi:10.1117/1.JATIS.2.1.011021
History: Received June 13, 2015; Accepted February 11, 2016
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Abstract.  To maintain the required Wide-Field Infrared Survey Telescope (WFIRST) coronagraph performance in a realistic space environment, a low-order wavefront sensing and control (LOWFS/C) subsystem is necessary. The LOWFS/C uses the rejected stellar light from the coronagraph to sense and suppress the telescope pointing errors as well as low-order wavefront errors (WFEs) due to changes in thermal loading of the telescope and the rest of the observatory. We will present a conceptual design of a LOWFS/C subsystem for the WFIRST-AFTA coronagraph. This LOWFS/C uses a Zernike phase contrast wavefront sensor (ZWFS) with a phase shifting disk combined with the stellar light rejecting occulting masks, a key concept to minimize the noncommon path error. We will present our analysis of the sensor performance and evaluate the performance of the line-of-sight jitter suppression loop, as well as the low-order WFE correction loop with a deformable mirror on the coronagraph. We will also report the LOWFS/C testbed design and the preliminary in-air test results, which show a very promising performance of the ZWFS.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Fang Shi ; Kunjithapatham Balasubramanian ; Randall Hein ; Raymond Lam ; Douglas Moore, et al.
"Low-order wavefront sensing and control for WFIRST-AFTA coronagraph", J. Astron. Telesc. Instrum. Syst. 2(1), 011021 (Mar 15, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011021


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