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OSIRIS optical design

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Abstract

The Optical System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS) has been designed as a Day-One optical instrument for the 10.4-m Gran Telescopio Canarias (GTC). Its conceptualization started as early as 1998. This contribution summarizes how the evolution of the OSIRIS concept forced the optical design to successfully respond to ever-harder challenges. It will be the first instrument, on such a large telescope, belonging to a new class of tunable imager, using tunable filters (TFs), and a single slit and multi-object low-resolution spectrograph. These features combined with charge shuffling capabilities, covering the optical wavelength range (365-1000 nm). OSIRIS, to be first mounted at one of GTC's Nasmyth platforms, is designed to be compact enough to fit at the Cassegrain focus as well. The optical design is devised around the classical concept of collimator plus camera. The collimator is an off axis ellipsoidal mirror, while the f/2.475 camera consists of several groups of all spherical surfaces lenses, forming a unit together with the detector and cryocooler. A folder mirror prevents interference with the GTC acquisition and guiding subsystem. Several combinations of color and interference filters, TFs and grisms are available in the collimated beam, near the pupil, to provide the wide versatility of required observing modes and resolutions. Short descriptions of the OSIRIS geometry, specifications and the optical design are presented, with emphasis in the strategy followed in the design process.

© 2002 Optical Society of America

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