13 June 2017 Rubidium-traced white-light etalon calibrator for radial velocity measurements at the cm s−1 level
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Abstract
We report on the construction and testing of a vacuum-gap Fabry–Pérot etalon calibrator for high precision radial velocity spectrographs. Our etalon is traced against a rubidium frequency standard to provide a cost effective, yet ultra precise wavelength reference. We describe here a turn-key system working at 500 to 900 nm, ready to be installed at any current and next-generation radial velocity spectrograph that requires calibration over a wide spectral bandpass. Where appropriate, we have used off-the-shelf, commercial components with demonstrated long-term performance to accelerate the development timescale of this instrument. Our system combines for the first time the advantages of passively stabilized etalons for optical and near-infrared wavelengths with the laser-locking technique demonstrated for single-mode fiber etalons. We realize uncertainties in the position of one etalon line at the 10    cm s 1 level in individual measurements taken at 4 Hz. When binning the data over 10 s, we are able to trace the etalon line with a precision of better than 3    cm s 1 . We present data obtained during a week of continuous operation where we detect (and correct for) the predicted, but previously unobserved shrinking of the etalon Zerodur spacer corresponding to a shift of 13    cm s 1 per day.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Julian Stürmer, Julian Stürmer, Andreas Seifahrt, Andreas Seifahrt, Christian Schwab, Christian Schwab, Jacob L. Bean, Jacob L. Bean, "Rubidium-traced white-light etalon calibrator for radial velocity measurements at the cm s−1 level," Journal of Astronomical Telescopes, Instruments, and Systems 3(2), 025003 (13 June 2017). https://doi.org/10.1117/1.JATIS.3.2.025003 . Submission: Received: 15 December 2016; Accepted: 11 May 2017
Received: 15 December 2016; Accepted: 11 May 2017; Published: 13 June 2017
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