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2010 CFHT Users Meeting
November 16-18, 2010
ASIAA Auditorium, Taipei, Taiwan

Poster Presentation

MOEMS-based MOS spectrograph at CFHT

Author(s): F. Zamkotsian, P. Spano, L. Martin, M. Riva, P. Lanzoni, F. Zerbi, L. Valenziano, L. Nicastro

Presenter: Frederic Zamkotsian (Laboratoire d'Astrophysique de Marseille)

Multi-Object Spectrographs (MOS) are major instruments for recording
simultaneously hundreds of spectra. Current object selection systems are limited and/or difficult to implement in next generation MOS for space and ground-based telescopes. A promising solution is the use of MOEMS devices such as micromirror arrays which allow the remote control of the multi-slit configuration in real time. We are developing a Digital Micromirror Device (DMD) - based spectrograph demonstrator. We want to access the largest FOV with the highest contrast. The selected component is a DMD chip from Texas Instruments in 2048 x 1080 mirrors format, with a pitch of 13.68┬Ám. Such component has been also studied by our team for application in EUCLID-NIS. Our optical design is an all-reflective spectrograph design with F/4 on the DMD component. This demonstrator permits the study of key parameters such as throughput, contrast and ability to remove unwanted sources in the FOV (background, spoiler sources), PSF effect, spectrum stability on the detector. This DMD-based MOS demonstrator will be used in the visible, and mounted at TNG at the beginning of 2012. Its modular and mirror-based design permits to adapt it for another telescope. We propose to use this demonstrator at CFHT in order to explore new domains of applications, both operationally and scientifically, such as using the demonstrator on PUEO corrected fields of view, and/ or with an IR detector. We could then show the ultimate performances of our demonstrator. All these developments will also allow addressing science cases in stellar and galaxy physics, by studying globular clusters and nearby as well as intermediate redshift galaxies.

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