Lyot-based ultra-fine pointing control system for phase mask coronagraphs

Garima Singh, Frantz Martinache, Pierre Baudoz, Olivier Guyon, Taro Matsuo, Christophe Clergeon

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

Abstract

High performance coronagraphic imaging at small inner working angle requires efficient control of low order aberrations. The absence of accurate pointing control at small separation not only degrades coronagraph starlight rejection but also increases the risk of confusing planet's photons with starlight leaking next to the coronagraph focal plane mask center. Addressing this issue is essential for preventing coronagraphic leaks, and we have thus developed a new concept, the Lyot-based pointing control system (LPCS), to control pointing errors and other low order aberrations within a coronagraph. The LPCS uses residual starlight reflected by the Lyot stop at the pupil plane. Our simulation has demonstrated pointing errors measurement accuracy between 2-12 nm for tip-tilt at 1.6 μm with a four quadrant phase mask coronagraph.

Original languageEnglish (US)
Title of host publication3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes
PublisherINAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi
ISBN (Print)9788890887604
DOIs
StatePublished - 2013
Externally publishedYes
Event3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013 - Florence, Italy
Duration: May 26 2013May 31 2013

Publication series

Name3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

Other

Other3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013
CountryItaly
CityFlorence
Period5/26/135/31/13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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