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9 July 2018 Two Fabry-Pérots and two calibration units for CARMENES
Sebastian Schäfer, Eike W. Guenther, Ansgar Reiners, Johannes Winkler, Michael Pluto, Jörg Schiller
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Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070276 (2018) https://doi.org/10.1117/12.2315241
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States
Abstract
The wavelength calibration and nightly drift measurements for CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs) are provided by a combination of hollow cathode lamps and two Fabry-Pérot units. CARMENES consists of two spectrograph, one for the visible part of the spectrum (520 -960 nm) and one for the near infrared (960 - 1710 nm). Each spectrograph has its own calibration unit and its own Fabry-Pérot. The calibration units are equipped with Th-Ne, U-Ar and U-Ne hollow cathode lamps as well as a flat field lamp. The Fabry-Pérots are optimized for the wavelength ranges of the spectrographs and use halogen-tungsten lamps as light sources. The Fabry-Pérots have a free spectral range of 15 GHz for the visible and 12.2 GHz for the near infrared which translates to 17,900 useful emission lines for the visible spectrograph and 9,700 for the infrared. These lines are used to compute the wavelength solution, and to monitor the instrumental drift during the night. The Fabry-Pérot units are temperature and pressure stabilized and designed to reach an internal stability of better than 10 cm/s per night. Here, we present the designs of both Fabry-Pérot units and the calibration units.
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Sebastian Schäfer, Eike W. Guenther, Ansgar Reiners, Johannes Winkler, Michael Pluto, and Jörg Schiller "Two Fabry-Pérots and two calibration units for CARMENES", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070276 (9 July 2018); https://doi.org/10.1117/12.2315241
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KEYWORDS
Calibration
Spectrographs
Near infrared
Temperature metrology
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