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Proceedings Paper

High-precision calibration of spectrographs using laser frequency combs
Author(s): Tobias Wilken; Christophe Lovis; Antonio Manescau; Tilo Steinmetz; Luca Pasquini; Gaspare Lo Curto; Theodor W. Hänsch; Ronald Holzwarth; Thomas Udem
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Paper Abstract

We present the first stringent tests of a novel calibration system based on a laser frequency comb (LFC) for radial velocity measurements. The tests were obtained with the high resolution, optical HARPS spectrograph. Photon noise limited repeatability of 9 cm s-1 was obtained, using only little more than one of 72 echelle orders. In the calibration curve CCD inhomogeneities showed up and could be calibrated, which were undetectable with previous Th-Ar calibrations. To obtain an even higher repeatability and lower residuals, a larger spectral bandwidth is necessary. An improved version of the LFC is currently under development. The results of the latest tests will be presented.

Paper Details

Date Published: 14 July 2010
PDF: 8 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77350T (14 July 2010); doi: 10.1117/12.857248
Show Author Affiliations
Tobias Wilken, Max-Planck-Institut für Quantenoptik (Germany)
Christophe Lovis, Observatoire de Genève (Switzerland)
Antonio Manescau, European Southern Observatory (Germany)
Tilo Steinmetz, Max-Planck-Institut für Quantenoptik (Germany)
Menlo Systems GmbH (Germany)
Luca Pasquini, European Southern Observatory (Germany)
Gaspare Lo Curto, European Southern Observatory (Germany)
Theodor W. Hänsch, Max-Planck-Institut für Quantenoptik (Germany)
Ronald Holzwarth, Max-Planck-Institut für Quantenoptik (Germany)
Menlo Systems GmbH (Germany)
Thomas Udem, Max-Planck-Institut für Quantenoptik (Germany)


Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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