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Proceedings Paper

Micromirror-array unit-magnification multiobject spectrograph for NGST
Author(s): Frederic Zamkotsian; Kjetil Dohlen; Veronique Buat; Denis Burgarella
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Paper Abstract

A Multi-Object Spectrograph (MOS) based on micro-opto- electro-mechanical systems is one of the three core instruments selected for the NGST. Our group is involved in the preliminary studies on a promising solution for this instrument using a Micro-Mirror Array (MMA). We have focused our work towards three main topics: surface characterization of the micro-mirrors, MMA optical modeling, and optical design for the MOS. An accurate surface characterization method, based upon Foucault's knife-edge test has been developed, for measuring sub-nanometer deformations. Using the non-sequential ray tracing ability of our ray-tracing program, we have simulated a block of nine micro-mirrors with individual tilt angles, for properly designing an MMA- MOS. Finally, two different concepts for the MOS have been studied: a spectrograph with focal reduction, and a unit- magnification spectrograph preceded by a focal adaptator. The unit-magnification all-reflecting spectrograph is very promising, with a compact design, a perfectly plane image surface, and geometrical spots smaller than the detector pixels.

Paper Details

Date Published: 28 July 2000
PDF: 7 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393976
Show Author Affiliations
Frederic Zamkotsian, Lab. d'Astrophysique de Marseille (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (France)
Veronique Buat, Lab. d'Astrophysique de Marseille (France)
Denis Burgarella, Lab. d'Astrophysique de Marseille (France)

Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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