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14 July 2010 High-precision calibration of spectrographs using laser frequency combs
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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.
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Tobias Wilken, Christophe Lovis, Antonio Manescau, Tilo Steinmetz, Luca Pasquini, Gaspare Lo Curto, Theodor W. Hänsch, Ronald Holzwarth, and Thomas Udem "High-precision calibration of spectrographs using laser frequency combs", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77350T (14 July 2010); doi: 10.1117/12.857248; https://doi.org/10.1117/12.857248
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