27 July 2016 CHOUGH: implementation and performance of a high-order 4m AO demonstrator
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Abstract
CHOUGH is a small, fast project to provide an experimental on-sky high-order SCAO capability to the 4.2m WHT telescope. The basic goal has r0-sized sub- apertures with the aim of achieving high-Strehl ratios (> 0:5) in the visible (> 650 nm). It achieves this by including itself into the CANARY experiment: CHOUGH is mounted as a breadboard and intercepts the beam within CANARY via a periscope. In doing so, it takes advantage of the mature CANARY infrastructure, but add new AO capabilities. The key instruments that CHOUGH brings to CANARY are: an atmospheric dispersion compensator; a 32 × 32 (1000 actuator) MEMS deformable mirror; 31 × 31 wavefront sensor; and a complementary (narrow-field) imager. CANARY provides a 241-actuator DM, tip/tilt mirror, and comprehensive off-sky alignment facility together with a RTC. In this work, we describe the CHOUGH sub-systems: backbone, ADC, MEMS-DM, HOWFS, CAWS, and NFSI.
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Nazim A. Bharmal, Nazim A. Bharmal, Alastair G. Basden, Alastair G. Basden, Cyril J. Bourgenot, Cyril J. Bourgenot, Martin Black, Martin Black, Cornelis M. Dubbeldam, Cornelis M. Dubbeldam, David M. Henry, David M. Henry, Daniel Hölck-Santibanez, Daniel Hölck-Santibanez, Timothy J. Morris, Timothy J. Morris, David J. Robertson, David J. Robertson, Jürgen Schmoll, Jürgen Schmoll, Robert G. Talbot, Robert G. Talbot, Eddy J. Younger, Eddy J. Younger, Richard M. Myers, Richard M. Myers, } "CHOUGH: implementation and performance of a high-order 4m AO demonstrator", Proc. SPIE 9909, Adaptive Optics Systems V, 990948 (27 July 2016); doi: 10.1117/12.2231721; https://doi.org/10.1117/12.2231721
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