Ultra-high-sensitivity wavefront sensing for extreme-AO

Olivier Guyon

doi:10.1117/12.790170

10 July 2008 Ultra-high-sensitivity wavefront sensing for extreme-AO

Olivier Guyon

Proceedings Volume 7015, Adaptive Optics Systems; 70151K (2008) https://doi.org/10.1117/12.790170
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

A new wavefront sensing scheme derived from curvature wavefront sensing is presented. Non-linear Curvature wavefront sensing (NLCWFS) is a scheme derived from conventional curvature wavefront sensing. NLCWFS uses four defocused pupil images and a non-linear wavefront reconstruction. NLCWFS is largely achromatic and does not require a flat (<1 rad RMS) wavefront to operate: it is therefore very robust, and is an attractive alternative to less efficient Shack-Hartmann wavefront sensing. For low order aberrations, sensitivity gains corresponding to 5 and 8 stellar magnitudes can be achieved over the conventional Shack-Hartmann sensor on respectively a 8-m telescope and a 30-m telescope.

Citation Download Citation

Olivier Guyon "Ultra-high-sensitivity wavefront sensing for extreme-AO", Proc. SPIE 7015, Adaptive Optics Systems, 70151K (10 July 2008); https://doi.org/10.1117/12.790170

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