Results from the laboratory demonstration of the nonlinear curvature wavefront sensor

Mala Mateen; Vincent Garrel; Michael Hart; Olivier Guyon

doi:10.1117/12.857727

22 July 2010 Results from the laboratory demonstration of the nonlinear curvature wavefront sensor

Mala Mateen, Vincent Garrel, Michael Hart, Olivier Guyon

Proceedings Volume 7736, Adaptive Optics Systems II; 773619 (2010) https://doi.org/10.1117/12.857727
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

In this paper we show why a non-linear curvature wavefront sensor (nlCWFS) is superior to both Shack-Hartmann wavefront sensor (SHWFS) and conventional curvature wavefront sensor (cCWFS) for sensing mV < 15 natural guide stars. We have developed an experimental setup aimed at comparing the the rms wavefront error obtained with the nlCWFS and the SHWFS. We describe our experimental setup and present results from the laboratory demonstration of the nlCWFS. The non-linear approach builds on the successful curvature wavefront sensing concept. The wavefront is reconstructed from the defocused pupil images using the Gerchberg-Saxton (GS) phase diversity algorithm. We compare results obtained from reconstructing the wavefront using a Shack-Hartmann wavefront sensor (SHWFS) and a nlCWFS for a monochromatic source. We discuss approaches to overcome non-linearity issues and discuss the challenge of using two WFSs in the same spatiotemporal control regime and the implementation of the nlCWFS on the 6.5 m MMT.

Citation Download Citation

Mala Mateen, Vincent Garrel, Michael Hart, and Olivier Guyon "Results from the laboratory demonstration of the nonlinear curvature wavefront sensor", Proc. SPIE 7736, Adaptive Optics Systems II, 773619 (22 July 2010); https://doi.org/10.1117/12.857727

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