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Journal of Astronomical Telescopes, Instruments, and Systems

Low-order wavefront sensing and control for WFIRST-AFTA coronagraph
Author(s): 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
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Paper 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.

Paper Details

Date Published: 15 March 2016
PDF: 19 pages
J. Ast. Inst. Sys. 2(1) 011021 doi: 10.1117/1.JATIS.2.1.011021
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 1
Show Author Affiliations
Fang Shi, Jet Propulsion Lab. (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Randall Hein, Jet Propulsion Lab. (United States)
Raymond Lam, Jet Propulsion Lab. (United States)
Douglas Moore, Jet Propulsion Lab. (United States)
James Moore, Jet Propulsion Lab. (United States)
Keith Patterson, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Joel Shields, Jet Propulsion Lab. (United States)
Erkin Sidick, Jet Propulsion Lab. (United States)
Hong Tang, Jet Propulsion Lab. (United States)
Tuan Truong, Jet Propulsion Lab. (United States)
J. Kent Wallace, Jet Propulsion Lab. (United States)
Xu Wang, Jet Propulsion Lab. (United States)
Daniel Wilson, Jet Propulsion Lab. (United States)


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