Phoenix: A Cryogenic High-Resolution 1-5 Micron Infrared Spectrograph

Physics – Optics

Scientific paper

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Cryogenics, Spectrographs, Infrared Radiation, Imaging Techniques, Spectroscopy, Infrared Detectors, Construction, Structural Design, Slits, Coolers, Telescopes, Closed Cycles

Scientific paper

We describe a cryogenic, high-resolution spectrograph (Phoenix) for the 1-5 micrometer region. Phoenix is an echelle spectrograph of the near-Littrow over-under configuration without cross dispersion. The foreoptics include Lyot reimaging, discrete and circular variable order sorting filters, a selection of slits, and optics for post-slit and Lyot imaging. The entire instrument is cooled to 50 K using two closed cycle coolers. The detector is a Hughes-Santa Barbara 512 x lO24 InSb array. Resolution of 65,000 has been obtained. Throughput without slit losses (but including telescope losses) is 13% at 2.3 micrometers. Recent results are discussed. Phoenix is a facility instrument of the National Optical Astronomy Observatories and will be available at CTIO(Cerro Tololo Inter-American Observatory), KPNO(Kitt Peak National Observatory), and Gemini.

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