Low order wavefront sensing and control for WFIRST-AFTA coronagraph

Fang Shi; Kunjithapatham Balasubramanian; Randall Bartos; Randall Hein; Brian Kern; John Krist; Raymond Lam; Douglas Moore; James Moore; Keith Patterson; Ilya Poberezhskiy; Joel Shields; Erkin Sidick; Hong Tang; Tuan Truong; Kent Wallace; Xu Wang; Dan Wilson

doi:10.1117/12.2188775

16 September 2015 Low order wavefront sensing and control for WFIRST-AFTA coronagraph

Fang Shi, Kunjithapatham Balasubramanian, Randall Bartos, Randall Hein, Brian Kern, John Krist, Raymond Lam, Douglas Moore, James Moore, Keith Patterson, Ilya Poberezhskiy, Joel Shields, Erkin Sidick, Hong Tang, Tuan Truong, Kent Wallace, Xu Wang, Dan Wilson

Author Affiliations +

Proceedings Volume 9605, Techniques and Instrumentation for Detection of Exoplanets VII; 960509 (2015) https://doi.org/10.1117/12.2188775
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

To maintain the required WFIRST Coronagraph starlight suppression 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 coronagraph to sense and suppress the telescope pointing drift and jitter as well as the low order wavefront errors due to changes in thermal loading on the telescope and the rest of the observatory. In this paper we will present an overview of the low order wavefront sensing and control subsystem for the WFIRST Coronagraph. We will describe LOWFS/C’s Zernike wavefront sensor concept and control design, and present an overview of sensing performance analysis and modeling, predicted line-of-sight jitter suppression loop performance, as well as the low order wavefront error correction with the coronagraph’s deformable mirror. We will also report the LOWFS/C testbed design and the preliminary in-air test results, which show promising performance of the Zernike wavefront sensor and FSM feedback loop.

Citation Download Citation

Fang Shi, Kunjithapatham Balasubramanian, Randall Bartos, Randall Hein, Brian Kern, John Krist, Raymond Lam, Douglas Moore, James Moore, Keith Patterson, Ilya Poberezhskiy, Joel Shields, Erkin Sidick, Hong Tang, Tuan Truong, Kent Wallace, Xu Wang, and Dan Wilson "Low order wavefront sensing and control for WFIRST-AFTA coronagraph", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 960509 (16 September 2015); https://doi.org/10.1117/12.2188775

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available