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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 23 — Dec. 1, 2012
  • pp: 4808–4810

Coronagraphic phase diversity: a simple focal plane sensor for high-contrast imaging

J.-F. Sauvage, L. Mugnier, B. Paul, and R. Villecroze  »View Author Affiliations

Optics Letters, Vol. 37, Issue 23, pp. 4808-4810 (2012)

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Exoplanet direct imaging is a challenging goal of today’s astronomical instrumentation. Several high-contrast imaging instruments dedicated to this task are currently being integrated; they are ultimately limited by the presence of quasi-static speckles in the imaging focal plane. These speckles originate in residual quasi-static optical aberrations, which must be measured and compensated for, typically at a nanometric level. We present a novel focal plane wavefront sensor (WFS) designed for this particular application. It is an extension of the phase diversity technique to coronagraphic imaging. This sensor requires no dedicated hardware and uses only two scientific images differing from a known aberration, which can be conveniently introduced by the adaptive optics subsystem. The aberrations are therefore calibrated all the way down to the scientific camera, without any differential aberrations between the sensor and the scientific camera. We show the potential of this WFS by means of simulations, and we perform a preliminary experimental validation.

© 2012 Optical Society of America

OCIS Codes
(010.7350) Atmospheric and oceanic optics : Wave-front sensing
(100.3190) Image processing : Inverse problems
(100.5070) Image processing : Phase retrieval
(350.1260) Other areas of optics : Astronomical optics
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: June 28, 2012
Revised Manuscript: September 28, 2012
Manuscript Accepted: October 2, 2012
Published: November 16, 2012

J.-F. Sauvage, L. Mugnier, B. Paul, and R. Villecroze, "Coronagraphic phase diversity: a simple focal plane sensor for high-contrast imaging," Opt. Lett. 37, 4808-4810 (2012)

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