Instantaneous phase retrieval with the vector vortex coronagraph: Theoretical and optical implementation
- Creators
- Riaud, P.
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Mawet, D.
- Magette, A.
Abstract
Coronagraphs are used as high-contrast imaging tools. However, it is well-known that the achievable contrast is primarily limited by wavefront aberrations in the optical train. Various kinds of devices and methods have been proposed to correct and calibrate these errors and, hence, improve the efficiency of coronagraphs. Here, we present an innovative idea that allows instantaneous measuring of the phase and the amplitude of residual stellar speckles in coronagraphic images. The technique is based on the unique polarization properties of the vector vortex coronagraph, which serves as a new type of phase diversity (POAM diversity), as well an extension of the Nijboer-Zernike theory of aberrations. We also propose and discuss a simple practical optical implementation of the technique, which only requires polarization splitting at the back-end of any existing vector vortex coronagraph systems.
Additional Information
© 2012 ESP. Article published by EDP Sciences. Received 16 May 2012; Accepted 19 July 2012. This work received the support of the University of Liège. This work was partly carried out at the European Southern Observatory (ESO) site of Vitacura (Santiago, Chile). The authors are grateful to C. Hanot (IAGL), D. Defrère (MPI-RA) for manuscript corrections. The authors wish to thank the referee Wesley Traub for his useful comments and corrections. The authors also acknowledge support from the Communauté française de Belgique – Actions de recherche concertées – Académie universitaire Wallonie-Europe. This idea dates back to 2005-2006 and the first author is grateful to section 17 and the CNAP French commissions for their outstanding recruitment work.Attached Files
Published - aa19614-12.pdf
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Additional details
- Eprint ID
- 57734
- Resolver ID
- CaltechAUTHORS:20150521-095215397
- University of Liège
- Communauté française de Belgique – Actions de recherche concertées – Académie universitaire Wallonie-Europe
- Created
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2015-05-21Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field