CHOUGH: spatially filtered Shack-Hartmann wave-front sensor for HOAO

Daniel Hölck; Nazim Ali Bharmal; Cornelis M. Dubbeldam; Richard M. Myers

doi:10.1117/12.2232364

27 July 2016 CHOUGH: spatially filtered Shack-Hartmann wave-front sensor for HOAO

Daniel Hölck, Nazim Ali Bharmal, Cornelis M. Dubbeldam, Richard M. Myers

Proceedings Volume 9909, Adaptive Optics Systems V; 990930 (2016) https://doi.org/10.1117/12.2232364
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The CANARY-Hosted Upgrade for High-Order Adaptive Optics (CHOUGH), is a narrow-field of view High- Order Single Conjugate on-sky AO demonstrator to be placed on the 4.2m WHT telescope. It aims to produce a Strehl ratio greater than 0.5 in the visible region of the spectrum (> 640nm). A High-Order wave-front sensor (HOWFS) is a central piece of the experiment; it is a Shack-Hartmann with a sampling of 31x31 subapertures across the pupil. A variable aperture spatial filter designed to reduce aliasing for high-spatial frequencies, located at a focal plane preceding the lenslet array. The HOWFS has a quad-cell configuration on the detector with a one-pixel guard ring and 48μm subaperture. The detector is a NuVu EMCCD camera, 24μm pixel size, operating at >500Hz. The lenslet array, collimator and relay are commercial off-the-shelf. This was technically challenging due to the small size of the pupil, 2.3mm, and the small optics involved in the design.

Citation Download Citation

Daniel Hölck, Nazim Ali Bharmal, Cornelis M. Dubbeldam, and Richard M. Myers "CHOUGH: spatially filtered Shack-Hartmann wave-front sensor for HOAO", Proc. SPIE 9909, Adaptive Optics Systems V, 990930 (27 July 2016); https://doi.org/10.1117/12.2232364

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