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Proceedings Paper

Adaptive beam-combining mirror for the MMT
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Paper Abstract

We present a novel, high performance, and economical design for tip-tilt mirrors. The two- dimensional tilt of each mirror is sensed through capacitive displacement sensors sensitive to approximately 1 nm rms out to 10 KHz. An analogue PID circuit utilizes this positional feedback to lock the mirrors to the commanded tilt via voice coil drivers. These mirrors achieve a 10 - 90% risetime of 3.0 ms and have a critically damped response at 100 - 150 Hz update rates. We have incorporated six of these tip-tilt mirrors to adaptively combine all six beams from the MMT. During first light of the instrument in April 1995, individual beams improved from 1.1 inch to 0.6 inch FWHM in 60 s exposures corrected with 60 Hz update rates.

Paper Details

Date Published: 25 August 1995
PDF: 11 pages
Proc. SPIE 2534, Adaptive Optical Systems and Applications, (25 August 1995); doi: 10.1117/12.217729
Show Author Affiliations
Laird Miller Close, Steward Observatory/Univ. of Arizona (United States)
Guido Brusa-Zappellini, Osservatorio Astrofisico d'Arcetri (United States)
Donald G. Bruns, ThermoTrex Corp. (United States)
Michael Lloyd-Hart, Steward Observatory/Univ. of Arizona (United States)
Donald W. McCarthy Jr., Steward Observatory/Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 2534:
Adaptive Optical Systems and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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