Calibration and Pre-Compensation of Non-Common Path Aberrations for extreme Adaptive Optics

Details Calibration and Pre-Compensation of Non-Common Path Aberrations for extreme Adaptive Optics Calibration and Pre-Compensation of Non-Common Path Aberrations for extreme Adaptive Optics

2007-03-05

arxiv.org/abs/astro-ph/0703077v1

Astronomy and Astrophysics

Astrophysics

40 pages, 14 figures (arXiv admin comment - one missing figure)

Scientific paper

10.1364/JOSAA.24.002334

Non-Common Path Aberrations (NCPA) are one of the main limitations for extreme Adaptive Optics (AO) system. NCPA prevent extreme AO systems to achieve their ultimate performance. These static aberrations are unseen by the wave front sensor and therefore not corrected in closed loop. We present experimental results validating new procedures of measurement and pre-compensation of the NCPA on the AO bench at ONERA. The measurement procedure is based on new refined algorithms of phase diversity. The pre-compensation procedure makes use of a pseudo-closed loop scheme to overcome the AO wavefront sensor model uncertainties. Strehl Ratio obtained in the images reaches 98.7% @ 632.8 nm. This result allows us to be confident of achieving the challenging performance required for extrasolar planet direct observation.

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