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Proceedings Paper

Performance of a laser frequency comb calibration system with a high-resolution solar echelle spectrograph
Author(s): H.-P. Doerr; T. J. Kentischer; T. Steinmetz; R. A. Probst; M. Franz; R. Holzwarth; Th. Udem; T. W. Hänsch; W. Schmidt
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Paper Abstract

Laser frequency combs (LFC) provide a direct link between the radio frequency (RF) and the optical frequency regime. The comb-like spectrum of an LFC is formed by exact equidistant laser modes, whose absolute optical frequencies are controlled by RF-references such as atomic clocks or GPS receivers. While nowadays LFCs are routinely used in metrological and spectroscopic fields, their application in astronomy was delayed until recently when systems became available with a mode spacing and wavelength coverage suitable for calibration of astronomical spectrographs. We developed a LFC based calibration system for the high-resolution echelle spectrograph at the German Vacuum Tower Telescope (VTT), located at the Teide observatory, Tenerife, Canary Islands. To characterize the calibration performance of the instrument, we use an all-fiber setup where sunlight and calibration light are fed to the spectrograph by the same single-mode fiber, eliminating systematic effects related to variable grating illumination.

Paper Details

Date Published: 13 September 2012
PDF: 8 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84501G (13 September 2012); doi: 10.1117/12.926224
Show Author Affiliations
H.-P. Doerr, Kiepenheuer-Institut für Sonnenphysik (Germany)
T. J. Kentischer, Kiepenheuer-Institut für Sonnenphysik (Germany)
T. Steinmetz, Menlo Systems GmbH (Germany)
Max-Planck-Institut fur Quantenoptik (Germany)
R. A. Probst, Menlo Systems GmbH (Germany)
Max-Planck-Institut für Quantenoptik (Germany)
M. Franz, Kiepenheuer-Institut für Sonnenphysik (Germany)
R. Holzwarth, Menlo Systems GmbH (Germany)
Max-Planck-Institut für Quantenoptik (Germany)
Th. Udem, Max-Planck-Institut für Quantenoptik (Germany)
T. W. Hänsch, Max-Planck-Institut für Quantenoptik (Germany)
W. Schmidt, Kiepenheuer-Institut für Sonnenphysik (Germany)

Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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