Ultra high precision wavefront sensing for Extreme-AO on ELTs

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High precision wavefront sensing is the key to detect low mass (potentially rocky) planets with ELTs. Ideally, a wavefront sensor for an Extreme-AO system should be both very sensitive (to allow high speed wavefront correction) and very accurate (to allow precise calibration of residual starlight vs. planet light in the focal plane). I describe two options which meet these requirements: (1) non-linear curvature wavefront sensing is several orders of magnitude more sensitive than conventional WFSs, and can work at full sensitivity in open loop or in the visible (2) focal plane wavefront sensing combines high sensitivity and is free from non-common path errors. It can also measure light coherence, and therefore separate speckles from planets. Combining these two schemes is especially attractive for Extreme-AO systems aimed at direct imaging of exoplanets with ELTs. Laboratory demonstration of both Focal plane wavefront sensing is also be presented.

Original languageEnglish (US)
Title of host publication1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes
EditorsYann Clenet, Jean-Marc Conan, Thierry Fusco, Gerard Rousset
PublisherEDP Sciences
ISBN (Electronic)9782759804962
DOIs
StatePublished - 2020
Event1st International Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2009 - Paris, France
Duration: Jun 22 2009Jun 26 2009

Publication series

Name1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

Conference

Conference1st International Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2009
CountryFrance
CityParis
Period6/22/096/26/09

ASJC Scopus subject areas

  • Space and Planetary Science
  • Control and Systems Engineering
  • Mechanical Engineering
  • Electronic, Optical and Magnetic Materials
  • Astronomy and Astrophysics
  • Instrumentation

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