28 June 2006 A laboratory experiment for demonstrating post-coronagraph wavefront sensing and control for extreme adaptive optics
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Proceedings Volume 6272, Advances in Adaptive Optics II; 62722L (2006); doi: 10.1117/12.672516
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States
Abstract
Direct detection of exo-planets from the ground will become a reality with the advent of a new class of extreme-adaptive optics instruments that will come on-line within the next few years. In particular, the Gemini Observatory will be developing the Gemini Planet Imager (GPI) that will be used to make direct observations of young exo-planets. One major technical challenge in reaching the requisite high contrast at small angles is the sensing and control of residual wave front errors after the starlight suppression system. This paper will discuss the nature of this problem, and our approach to the sensing and control task. We will describe a laboratory experiment whose purpose is to provide a means of validating our sensing techniques and control algorithms. The experimental demonstration of sensing and control will be described. Finally, we will comment on the applicability of this technique to other similar high-contrast instruments.
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J. Kent Wallace, Randall Bartos, Shanti Rao, Rocco Samuele, Edouard Schmidtlin, "A laboratory experiment for demonstrating post-coronagraph wavefront sensing and control for extreme adaptive optics", Proc. SPIE 6272, Advances in Adaptive Optics II, 62722L (28 June 2006); doi: 10.1117/12.672516; https://doi.org/10.1117/12.672516
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KEYWORDS
Calibration

Coronagraphy

Beam splitters

Wavefronts

Nulling interferometry

Gemini Planet Imager

Mirrors

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