A 1 - 5 micron cooled grating array spectrometer and Fabry Perot system for UKIRT

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cryogenic Cooling, Fabry-Perot Spectrometers, Gratings (Spectra), Infrared Spectrometers, Infrared Telescopes, Spectral Resolution, Spectral Sensitivity, United Kingdom

Scientific paper

A common-user cooled grating array spectrometer has been built for use at the Cassegrain focus of the 3.8-m UK Infrared Telescope (UKIRT). The instrument, which is designed to give resolutions of around 500 over the 1-5-micron spectral range, uses a seven-element InSb array. The exit apertures of the system are defined by the array elements so that seven almost adjacent resolution elements are sampled simultaneously. A pair of gold-coated replica gratings on copper substrates are mounted back to back to give high efficiency over the whole wavelength range. The spectrometer is mounted in a commercially available cryostat, with the optics cooled to liquid-nitrogen temperature and the array and associated electronics cooled to solid-nitrogen temperature. A number of room-temperature Fabry-Perot etalons are available which can be mounted in front of the spectrometer to increase the resolution up to 10 km/s between 2 and 5 microns. The grating spectrometer and Fabry-Perot system have both been successfully commissioned on UKIRT. Sensitivity and other test data are presented along with a description of the spectrometer, array, electronics and Fabry-Perot system.

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