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24 September 2012 Achieving a few cm/sec calibration repeatability for high resolution spectrographs: the laser frequency comb on HARPS
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Abstract
The laser frequency comb, with its extreme precision, opens a new window for high precision spectroscopy for current facilities, as well as for the ELT's. We report on the latest performance of the laser frequency comb obtained in combination with the HARPS spectrograph, which allowed calibration with cm/sec repeatability. The laser frequency comb system developed is described. Details of its laboratory set-up, characterization and integration with HARPS are shown. The results of the recent test campaigns are presented, showing excellent performance in terms of repeatability as well as wavelength coverage. Preliminary on sky data and next activities to integrate such a system in HARPS are presented.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gaspare Lo Curto, Antonio Manescau, Gerardo Avila, Luca Pasquini, Tobias Wilken, Tilo Steinmetz, Ronald Holzwarth, Rafael Probst, Thomas Udem, Theodor W. Hänsch, Jonay I. González Hernández, Massimiliano Esposito, Rafael Rebolo, Bruno Canto Martins, and Jose Renan de Medeiros "Achieving a few cm/sec calibration repeatability for high resolution spectrographs: the laser frequency comb on HARPS", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84461W (24 September 2012); doi: 10.1117/12.925964; https://doi.org/10.1117/12.925964
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