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Proceedings Paper

Progress of the MMT adaptive optics program
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Paper Abstract

The adaptive optics (AO) system for the 6.5 m MMT conversion telescope is the first to compensate the aberrated wavefront at the telescope's secondary mirror. This approach has unique advantages in terms of optical simplicity, high throughput and low emissivity. Its realization presents many technical challenges, which have now been overcome. The deformable mirror is now characterized and accepted. It features a 1.9mm thick 640mm diameter convex aspheric mirror (manufactured at the Steward Observatory Mirror Lab), mounted on a 50 mm thick ULE reference body with 336 actuators, as well as a cluster of 168 DSP's and associated analog circuitry. A wavefront sensor with integrated CCD and lenslet array has also been completed. The complete system is now starting to produce laboratory results, which we present below. Closed loop operation is tested under an auto-collimation illumination system that reflects aberrated artificial starlight from the convex secondary.

Paper Details

Date Published: 4 February 2002
PDF: 8 pages
Proc. SPIE 4494, Adaptive Optics Systems and Technology II, (4 February 2002);
Show Author Affiliations
Francois P. Wildi, Steward Observatory/Univ. of Arizona (United States)
Guido Brusa-Zappellini, Osservatorio Astrofisico di Arcetri and Steward Observatory/Univ. of Arizona (United States)
Armando Riccardi, Osservatorio Astrofisico di Arcetri (Italy)
R. G. Allen, Steward Observatory/Univ. of Arizona (United States)
Michael Lloyd-Hart, Steward Observatory/Univ. of Arizona (United States)
D Miller, Steward Observatory/Univ. of Arizonia (United States)
Buddy Martin, Steward Observatory/Univ. of Arizona (United States)
Roberto Biasi, MicroGate S.r.l. (Italy)
Daniele Gallieni, ADS International S.r.l. (Italy)

Published in SPIE Proceedings Vol. 4494:
Adaptive Optics Systems and Technology II
Robert K. Tyson; Domenico Bonaccini; Michael C. Roggemann, Editor(s)

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