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

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.

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

References in corpus (1)

• Fundamental limitations on Earth-like planet detection with Extremely Large Telescopes

Cited by in corpus (31)

• SPHERE: the exoplanet imager for the Very Large Telescope
• Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor
• SPHERE / ZIMPOL high resolution polarimetric imager. I. System overview, PSF parameters, coronagraphy, and polarimetry
• Application of a damped Locally Optimized Combination of Images method to the spectral characterization of faint companions using an Integral Field Spectrograph
• High Contrast Imaging with an Arbitrary Aperture: Active Correction of Aperture Discontinuities
• An all-photonic focal-plane wavefront sensor
• Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor. II. Concept validation with ZELDA on VLT/SPHERE
• Apodized Pupil Lyot Coronagraphs for Arbitrary Apertures. IV. Reduced Inner Working Angle and Increased Robustness to Low-Order Aberrations
• SPHERE / ZIMPOL observations of the symbiotic system R Aqr. I. Imaging of the stellar binary and the innermost jet clouds
• Fast & Furious focal-plane wavefront sensing
• Active correction of aperture discontinuities - optimized stroke minimization II: optimization for future missions
• Coronagraphic phase diversity: performance study and laboratory demonstration
• Calibration of the island effect: Experimental validation of closed-loop focal plane wavefront control on Subaru/SCExAO
• Focal-plane wavefront sensing with photonic lanterns I: theoretical framework
• Kernel phase imaging with VLT/NACO: high-contrast detection of new candidate low-mass stellar companions at the diffraction limit
• On-Line Long-Exposure Phase Diversity: a Powerful Tool for Sensing Quasi-Static Aberrations of Extreme Adaptive Optics Imaging Systems
• Laser beam complex amplitude measurement by phase diversity
• Analysis of on-sky MOAO performance of CANARY using natural guide stars
• Active correction of aperture discontinuities - optimized stroke minimization I: a new adaptive interaction matrix algorithm
• Increasing the raw contrast of VLT/SPHERE with the dark-hole technique. II. On-sky wavefront correction and coherent differential imaging
• On-sky validation of image-based adaptive optics wavefront sensor referencing
• Laboratory verification of 'Fast & Furious' phase diversity: Towards controlling the low wind effect in the SPHERE instrument
• Calibration of quasi-static aberrations in exoplanet direct-imaging instruments with a Zernike phase-mask sensor. IV. Temporal stability of non-common path aberrations in VLT/SPHERE
• Portable Adaptive Optics for Exoplanet Imaging
• All-fibre wavefront sensor
• Laboratory comparison of coronagraphic concepts under dynamical seeing and high-order adaptive optics correction
• FFREE: a Fresnel-FRee Experiment for EPICS, the EELT planets imager
• Astrophotonics -- current capabilities and the road ahead
• Focal-plane wavefront sensing with high-order adaptive optics systems
• Chasing the storm: Investigating the application of high-contrast imaging techniques in producing precise exoplanet light curves
• On-sky compensation of non-common path aberrations with the ZELDA wavefront sensor in VLT/SPHERE