Laboratory Results in High Contrast Imaging with the Shaped Pupil Coronagraph

Details Laboratory Results in High Contrast Imaging with the Shaped Pupil Coronagraph Laboratory Results in High Contrast Imaging with the Shaped Pupil Coronagraph

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..24b&link_type=abstract

Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s

Computer Science

Performance

Scientific paper

Direct imaging of extrasolar planets, and terrestrial planets in particular, is an exciting but difficult problem requiring a telescope imaging system with unprecedented levels of contrast. One promising design is the Shaped Pupil Coronagraph (SPC), pioneered by our lab at Princeton. The SPC was designed to achieve 10^10 contrast at an inner working angle of 4 lamdba/D, based on the requirements of NASA's space-based Terrestrial Planet Finder Coronagraph (TPF-C) mission. However, it has long been recognized that a key problem in achieving these requirements in practice is estimation and control of telescope aberrations in broadband light. Furthermore, it is crucial to control these aberrations as fast as possible because of finite mission lifetime as well as due to the dynamic nature of some aberrations. In this paper, we summarize the most recent experimental results of wavefront control in monochromatic as well as broadband light on the testbeds at Princeton and JPL, as well as describe the experimental techniques and the algorithms used. In particular, we describe the sources of contrast limiting factors we encountered and methods used to overcome them, which in turn defines the requirements for the hardware and algorithm performance. We also demonstrate a detection of synthetic planets and exo-zodiacal light on the testbed.

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