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Proceedings Paper

Low cost photonic comb for sub-m/s wavelength calibration
Author(s): Christopher H. Betters; Maxime Hermouet; Thomas Blanc; James I. Colless; Joss Bland-Hawthorn; Janez Kos; Sergio Leon-Saval
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Paper Abstract

A fundamental limitation of precision radial velocity measurements is the accuracy and stability of the calibration source. Here we present a low-cost alternative to more complex laser metrology based systems that utilises a single-mode fibre Fabry-Perot etalon. There are three key elements on this photonic comb: i) an optical fibre etalon with thermo-electric coolers; ii) a Rubidium Saturation Absorption Spectroscopy (SAS) setup; and iii) an optical fibre switch system for simultaneous laser locking of the etalon. We simultaneously measure the Rubidium D2 transitions around 780.2 nm and the closest etalon line. A PID loop controls the etalon temperate to maintain the position of its peak with an RMS error of <10cm/s for 10 minute integration intervals in continous operation. The optical fibre switch system allows for a time multiplexed coupling of the etalon to a spectrograph and SAS system.

Paper Details

Date Published: 22 July 2016
PDF: 7 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99126Y (22 July 2016); doi: 10.1117/12.2233678
Show Author Affiliations
Christopher H. Betters, The Univ. of Sydney (Australia)
Maxime Hermouet, The Univ. of Sydney (Australia)
Institut National des Sciences Appliquées de Toulouse (France)
Thomas Blanc, The Univ. of Sydney (Australia)
Institut National des Sciences Appliquées de Toulouse (France)
James I. Colless, The Univ. of Sydney (Australia)
Joss Bland-Hawthorn, The Univ. of Sydney (Australia)
Janez Kos, The Univ. of Sydney (Australia)
Sergio Leon-Saval, The Univ. of Sydney (Australia)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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