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A fibre scrambling unit for the laser frequency comb of ESPRESSO
Author(s): Christoph Frank; Florian Kerber; Gerardo Avila; Nicola Di Lieto; Gaspare Lo Curto; Antonio Manescau
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Paper Abstract

ESPRESSO (Echelle Spectrograph for Rocky Exoplanet and Stable Spectroscopic Observations) is a fiber-fed, crossdispersed, high resolution and ultra-stable echelle spectrograph is designed to enable a new quality of quantitative science on ESO’s Very Large Telescope (VLT). Its science cases, range from exo-planets to the study of the physical constants call for a precision of 10 cm/s in radial velocity. To this end the ESPRESSO spectrograph, recently installed at ESO’s Paranal observatory, uses a laser frequency comb (LFC) to provide a grid of equidistant lines to deliver a high precision, high accuracy wavelength calibration traceable to the SI frequency standard. The unit is inserted in the light path between the laser frequency comb and the calibration unit delivering the calibration light to the ESPRESSO spectrograph. The scrambler ensures that the injection fibre of the spectrograph is homogenously illuminated preserving the excellent qualities of the LFC light and thus avoiding introducing systematics that could compromise the wavelength calibration and the science performance. In this context it is essential that photon-noise limited performance is achieved. The ESPRESSO spectrograph will be available to the astronomical community starting October 1st, 2018.

Paper Details

Date Published: 8 July 2018
PDF: 10 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107026P (8 July 2018); doi: 10.1117/12.2313484
Show Author Affiliations
Christoph Frank, European Southern Observatory (Germany)
Florian Kerber, European Southern Observatory (Germany)
Gerardo Avila, European Southern Observatory (Germany)
Nicola Di Lieto, European Southern Observatory (Germany)
Gaspare Lo Curto, European Southern Observatory (Chile)
Antonio Manescau, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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