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Proceedings Paper

Toward 1010 contrast for terrestrial exoplanet detection: demonstration of wavefront correction in a shaped-pupil coronagraph
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Paper Abstract

The Shaped Pupil Coronagraph (SPC) is a high-contrast imaging system pioneered at Princeton for detection of extra-solar earthlike planets. It is designed to achieve 10-10 contrast at an inner working angle of 4λ/D. However, a critical requirement in attaining this contrast level in practice is the ability to control wavefront phase and amplitude aberrations to at least λ/104 in rms phase and 1/1000 rms amplitude, respectively. Furthermore, this has to be maintained over a large spectral band. The High Contrast Imaging Testbed (HCIT) at the Jet Propulsion Lab (JPL) is a state-of-the-art facility for studying high contrast imaging systems and fine wavefront control methods. It consists of a vacuum chamber containing a configurable coronagraph setup with a Xinetics deformable mirror. In this paper, we present the results of testing Princeton's SPC in JPL's HCIT. In particular, we present the achievement of 4x10-8 contrast using a speckle nulling algorithm, and demonstrate that this contrast is maintained across wavelengths of 785, 836nm, and for broadband light having 10% bandwidth around 800nm.

Paper Details

Date Published: 5 July 2006
PDF: 10 pages
Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 626518 (5 July 2006); doi: 10.1117/12.672511
Show Author Affiliations
Ruslan Belikov, Princeton Univ. (United States)
Amir Give'on, Princeton Univ. (United States)
John T. Trauger, Jet Propulsion Lab. (United States)
Michael Carr, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Robert J. Vanderbei, Princeton Univ. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Andreas Kuhnert, Jet Propulsion Lab (United States)

Published in SPIE Proceedings Vol. 6265:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
John C. Mather; Howard A. MacEwen; Mattheus W. M. de Graauw, Editor(s)

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