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Proceedings Paper

A ground-layer AO system demonstrator for the William Herschel Telescope
Author(s): Timothy J. Morris; Paul Berry; Timothy Butterley; Paul Clark; Colin N. Dunlop; Richard M. Myers; Christopher D. Saunter; Richard W. Wilson
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Paper Abstract

An experimental Ground Layer Adaptive Optics system utilizing a low-altitude Rayleigh Laser Guide Star is presented. This demonstrator is designed for the GHRIL Nasmyth platform of the 4.2m William Herschel Telescope, where it uses a low-altitude (~4km) focused-spot 523nm Rayleigh-scatter beacon, launched from behind the secondary mirror using an independent beam launch telescope. A novel range-gate is used to select the LGS return altitude for wavefront sensing, whilst wavefront correction uses a 97-actuator continuous phase sheet deformable mirror and separate tip-tilt mirror. The performance can be monitored on-axis and off-axis. These and other aspects of the demonstration system are described in detail, including optical design, laser launch technique, laboratory performance, and a preliminary assessment of potential on-sky performance.

Paper Details

Date Published: 25 October 2004
PDF: 14 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551252
Show Author Affiliations
Timothy J. Morris, Univ. of Durham (United Kingdom)
Paul Berry, Univ. of Durham (United Kingdom)
Timothy Butterley, Univ. of Durham (United Kingdom)
Paul Clark, Univ. of Durham (United Kingdom)
Colin N. Dunlop, Univ. of Durham (United Kingdom)
Richard M. Myers, Univ. of Durham (United Kingdom)
Christopher D. Saunter, Univ. of Durham (United Kingdom)
Richard W. Wilson, Univ. of Durham (United Kingdom)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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