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Proceedings Paper

TMT DMs final design and advanced prototyping results at Cilas
Author(s): Jean-Christophe Sinquin; Arnaud Bastard; Corinne Boyer; Sébastien Cornette; Raphaël Cousty; Brent Ellerbroek; Xavier Gilbert; Benoit Gourdet; Régis Grasser; Denis Groeninck; Claude Guillemard; Glen Herriot; Albert Iannacone; Antoine Jeulin; Aurélien Moreau; Hubert Pagès; Lianqi Wang
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Paper Abstract

In order to prepare for the construction phase of the two Deformable Mirrors (DMs), which will be used in the Thirty Meter Telescope (TMT) first light Adaptive Optics (AO) system, Cilas has advanced the design of these two large size piezo DMs and has manufactured and tested a scaled demonstration prototype. The work done allowed significant reduction of the risks related to the demanding specifications of the TMT DMs; the main issues were: (i) Large pupil (up to 370 mm) and high order (up to 74x74); (ii) Relatively low operational temperature (DMs working at -30°C); (iii) New piezo material. It is important to develop such a prototype to take into account these three specifications all together (dimension, low temperature and new piezo material). The new prototype is a 6x60 actuators and has the same characteristics as the future TMT DMs. In this paper, we give the conclusions of the work through the presentation of the following items: (i) Design and finite element analysis of the two DMs and prototype; (ii) Test results obtained with the prototype with validation of the finite element analysis and compliance with the TMT AO specifications; (iii) Special focus on thermal behavior, actuator reliability and shape at rest stability.

Paper Details

Date Published: 13 September 2012
PDF: 14 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844706 (13 September 2012); doi: 10.1117/12.925313
Show Author Affiliations
Jean-Christophe Sinquin, CILAS (France)
Arnaud Bastard, CILAS (France)
Corinne Boyer, Thirty Meter Telescope Observatory Corp. (United States)
Sébastien Cornette, CILAS (France)
Raphaël Cousty, CILAS (France)
Brent Ellerbroek, Thirty Meter Telescope Observatory Corp. (United States)
Xavier Gilbert, CILAS (France)
Benoit Gourdet, CILAS (France)
Régis Grasser, CILAS (France)
Denis Groeninck, CILAS (France)
Claude Guillemard, CILAS (France)
Glen Herriot, NRC Herzberg Institute of Astrophysics (Canada)
Albert Iannacone, CILAS (France)
Antoine Jeulin, CILAS (France)
Aurélien Moreau, CILAS (France)
Hubert Pagès, CILAS (France)
Lianqi Wang, Thirty Meter Telescope Observatory Corp. (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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