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14 July 2010 High-precision calibration of spectrographs using laser frequency combs
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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