Advanced static speckle calibration for exoplanet imaging

Details Advanced static speckle calibration for exoplanet imaging Advanced static speckle calibration for exoplanet imaging

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7736e..77p&link_type=abstract

Adaptive Optics Systems II. Edited by Ellerbroek, Brent L.; Hart, Michael; Hubin, Norbert; Wizinowich, Peter L. Proceedings o

Physics

Optics

Scientific paper

In this communication we address the problem of post coronagraphic wavefront reconstruction. In high contrast imaging applications it is crucial to estimate the wavefront after the coronagraph, as close as possible to the science camera, in order to minimize non-common path errors. However closing the loop on such a measurement is a difficult exercise since several low order modes have been cancelled by the coronagraphs, thus leading to ill-posed inversion problems. Moreover sensing at the science detector is an intrusive method that disrupts the course of the observations. The Gemini Planet Imager (GPI) calibration system, based on a post-coronagraphic interferometer, provides an estimate of mid to high spatial frequencies aberrations that alleviates these two issues. However such a measurement have an intrinsic limitations that is related to the differential path errors between the two arm of the interferometer. In this paper we show how to devise wavefront reconstruction algorithms that account for these differential path errors. We identify two regimes, relative and absolute wavefront sensing, that depend on the magnitudes of the aberrations and the design of the coronagraph. We illustrate the performances for each regime. Finally we present experimental results obtained during the validation phase of show the results on laboratory data.

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