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Proceedings Paper

Final prototype design for the adaptive secondary mirror of the 6.5-m MMT
Author(s): Donald G. Bruns; Todd K. Barrett; Timothy J. Brinkley; Domingo Goyena; David G. Sandler; Hubert M. Martin; Guido Brusa; James Roger P. Angel
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Paper Abstract

The upgraded 6.5 m MMT in Arizona will use an adaptive secondary to optimize performance in the near infrared spectral region. The secondary mirror is a 2 mm thick, 640 mm diameter Zerodur shell suspended only by a flexible center hub. Three hundred voice coil actuators installed in an aluminum reference surface deform the shell according to commands from a wavefront sensor. Capacitor position sensors surrounding each actuator provide feedback in an inner servo loop, much faster than the exterior wavefront sensor control bandwidth. A 60 actuator prototype, nearly identical to the final adaptive secondary size, has been built and is currently being tested.

Paper Details

Date Published: 17 October 1997
PDF: 9 pages
Proc. SPIE 3126, Adaptive Optics and Applications, (17 October 1997); doi: 10.1117/12.290145
Show Author Affiliations
Donald G. Bruns, ThermoTrex Corp. (United States)
Todd K. Barrett, ThermoTrex Corp. (United States)
Timothy J. Brinkley, ThermoTrex Corp. (United States)
Domingo Goyena, ThermoTrex Corp. (United States)
David G. Sandler, ThermoTrex Corp. (United States)
Hubert M. Martin, Univ. of Arizona Steward Observatory (United States)
Guido Brusa, Univ. of Arizona Steward Observatory (United States)
James Roger P. Angel, Univ. of Arizona Steward Observatory (United States)

Published in SPIE Proceedings Vol. 3126:
Adaptive Optics and Applications
Robert K. Tyson; Robert Q. Fugate, Editor(s)

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