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Proceedings Paper

OSIRIS optical design
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Paper Abstract

The Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS) is a first generation instrument for the 10.4-m Gran Telescopio Canarias (GTC) that will be operational in mid-2004. On such a large telescope, OSIRIS is the first instrument to use tunable filters, combined with charge shuffling capabilities, covering the wavelength range (365 - 1000 nm). To be installed first at a Nasmyth platform, OSIRIS is also compact enough to fit in the Cassegrain focus envelope. This paper discusses the OSIRIS optical design process based on the classical collimator plus camera focal reducer configuration concept. To provide a wide mode and resolution versatility, several combinations of grisms, color, order sorter, interference and tunable filters are attainable in the collimated beam, near the pupil. The OSIRIS geometry, specifications, features, and performance are briefly discussed. Subsection (#5) is centered on the pupil size to calculate angular magnification and collimator FOV. These values are compared with those taken from similar instruments for 6.5-m to 10-m telescopes. This contribution is meant to share our experience on the optical design issue with colleagues not necessarily familiarized with astronomical instrumentation design. A previous approach on the OSIRIS optical design and two more general descriptions are available.

Paper Details

Date Published: 23 December 2002
PDF: 9 pages
Proc. SPIE 4832, International Optical Design Conference 2002, (23 December 2002); doi: 10.1117/12.486467
Show Author Affiliations
Francisco J. Cobos, Univ. Nacional Autonoma de Mexico (Mexico)
J. Jesus Gonzalez, Univ. Nacional Autonoma de Mexico (Mexico)
Carlos Tejada, Univ. Nacional Autonoma de Mexico (Mexico)
Jordi Cepa, Instituto de Astrofisica de Canarias and IAC (Spain)
Jose Luis Rasilla, Instituto de Astrofisica de Canarias (Spain)


Published in SPIE Proceedings Vol. 4832:
International Optical Design Conference 2002
Paul K. Manhart; Jose M. Sasian, Editor(s)

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