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

@article{Sauvage-a-07, abstract = {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.}, author = {Sauvage, J. F. and Fusco, T. and Rousset, G. and Petit, C. }, citeulike-article-id = {1151138}, eprint = {astro-ph/0703077}, keywords = {aberrations, adaptive, calibration, extreme, ncpa, optics, pre-compensation}, month = {Mar}, posted-at = {2007-03-19 12:25:18}, priority = {0}, title = {Calibration and Pre-Compensation of Non-Common Path Aberrations for extreme Adaptive Optics}, url = {http://arxiv.org/abs/astro-ph/0703077}, year = {2007} }

TY - JOUR ID - Sauvage-a-07 L3 - citeulike-article-id:1151138 TI - Calibration and Pre-Compensation of Non-Common Path Aberrations for extreme Adaptive Optics N2 - 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. KW - aberrations KW - adaptive KW - calibration KW - extreme KW - ncpa KW - optics KW - pre-compensation AU - Sauvage, JF AU - Fusco, T AU - Rousset, G AU - Petit, C PY - 2007/Mar/05/ UR - http://arxiv.org/abs/astro-ph/0703077 ER -