Preliminary optical design for the Flamingos-2 near-infrared multi-silt spectrograph and imager for Gemini-South

Harland W. Epps; Richard Elston

doi:10.1117/12.461437

7 March 2003 Preliminary optical design for the Flamingos-2 near-infrared multi-silt spectrograph and imager for Gemini-South

Harland W. Epps, Richard Elston

Author Affiliations +

Proceedings Volume 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes; (2003) https://doi.org/10.1117/12.461437
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The University of Florida previously designed and implemented a fully-cryogenic near-infrared multi-object (slit) spectrograph and imager called Flamingos which has been used successfully at the f/8.0 Cassegrain focus of the Kitt Peak 4.0-m telescope and elsewhere. Current plans are under way to design an to build a similar but larger, more efficient follow-on near-infrared instrument to be used at the f/16.0 focus of the 8.0-m Gemini-South telescope. The new design is called Flamingos-2. It will accommodate the (1.00 to 2.40)-micron wavelength range for grism-driven spectroscopy and it will provide direct imaging in the customary J-, H- and K-band(s). It will feature a 100.0-mm diameter collimated beam and it will reimage at 100.0 microns/arcsec upon a flat RSC Hawaii-2 (2048 by 2048 by 18-micron) array. We have designed preliminary all-refracting, all-spherical cryogenic optics for Flamingos-2. Near-infrared optical material alternatives are discussed. The importance of using low-index materials is emphasized. Our 6-element collimator contains only one high-index (ZnSe) element. Our 6-element camera contains no high-index element. It uses a medium-index near-infrared transmitting optical glass which provides excellent color correction. We present these fully-quantitative preliminary optical designs for Flamingos-2 together with our anlaysis of its expected performance for spectroscopy and for direct-imaging applications.

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Harland W. Epps and Richard Elston "Preliminary optical design for the Flamingos-2 near-infrared multi-silt spectrograph and imager for Gemini-South", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); https://doi.org/10.1117/12.461437

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