CaltechAUTHORS
  A Caltech Library Service

Extinction controlled Adaptive Mask Coronagraph Lyot and Phase Mask dual concept for wide extinction area

Bourget, P. and Schuhler, N. and Mawet, D. and Haguenauer, P. and Girard, J. and Gonte, F. (2012) Extinction controlled Adaptive Mask Coronagraph Lyot and Phase Mask dual concept for wide extinction area. In: Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II. Proceedings of SPIE. No.8450. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 84505I. ISBN 9780819491510. https://resolver.caltech.edu/CaltechAUTHORS:20150521-131825253

[img] PDF
See Usage Policy.

2MB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20150521-131825253

Abstract

A dual coronagraph based on the Adaptive Mask concept is presented in this paper. A Lyot coronagraph with a variable diameter occulting disk and a nulling stellar coronagraph based on the Adaptive Phase Mask concept using polarization interferometry are presented in this work. Observations on sky and numerical simulations show the usefulness of the proposed method to optimize the nulling efficiency of the coronagraphs. In the case of the phase mask, the active control system will correct for the detrimental effects of image instabilities on the destructive interference (low-order aberrations such as tip-tilt and focus). The phase mask adaptability both in size, phase and amplitude also compensate for manufacturing errors of the mask itself, and potentially for chromatic effects. Liquid-crystal properties are used to provide variable transmission of an annulus around the phase mask, but also to achieve the achromatic π phase shift in the core of the PSF by rotating the polarization by 180°.A compressed mercury (Hg) drop is used as an occulting disk for the Lyot mask, its size control offers an adaptation to the seeing conditions and provides an optimization of the Tip-tilt correction.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.927284DOIArticle
ORCID:
AuthorORCID
Mawet, D.0000-0002-8895-4735
Girard, J.0000-0001-8627-0404
Additional Information:2012 Society of Photo-Optical Instrumentation Engineers (SPIE). Paper Date Published: 13 September 2012. This work was carried out at the European Southern Observatory (ESO) site of Vitacura (Santiago, Chile).
Funders:
Funding AgencyGrant Number
European Southern Observatory (ESO)UNSPECIFIED
Subject Keywords:high-contrast imaging, coronagraphy, polarization, high angular resolution, phase mask, adaptive optics
Series Name:Proceedings of SPIE
Issue or Number:8450
DOI:10.1117/12.927284
Record Number:CaltechAUTHORS:20150521-131825253
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150521-131825253
Official Citation:P. Bourget ; N. Schuhler ; D. Mawet ; P. Haguenauer ; J. Girard, et al. "Extinction controlled adaptive mask coronagraph Lyot and phase mask dual concept for wide extinction area", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84505I (September 13, 2012); doi:10.1117/12.927284; http://dx.doi.org/10.1117/12.927284
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57744
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:21 May 2015 20:50
Last Modified:10 Nov 2021 21:54

Repository Staff Only: item control page