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Proceedings Paper

A stable and inexpensive wavelength reference for precise wavelength calibration of radial velocity spectrographs
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Paper Abstract

We present a stable, inexpensive wavelength reference, based on a white-light interferometer for the use on current and future (arrays of) diffraction-limited radial velocity (RV) spectrographs. The primary aim of using an interferometer is to obtain a dense sinusoidal wavelength reference with spectral coverage between 450-650 nm. Its basic setup consists of an unbalanced fiber Mach-Zehnder interferometer (FMZI) that creates an interference pattern in the spectral domain due to superposition of phase delayed light, set by a fixed optical path-length difference (OPD). To achieve long-term stability, the interferometer is actively locked to a stable atomic line. The system operates in closed-loop using a thermo-optic modulator as the phase feedback component. We conducted stability measurements by superimposing the wavelength reference with thorium-argon (ThAr) emission lines and found the differential RMS shift to be ~5 m s-1 within 30 minute bins in an experiment lasting 5 hours.

Paper Details

Date Published: 5 August 2014
PDF: 9 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914780 (5 August 2014); doi: 10.1117/12.2055674
Show Author Affiliations
Tobias Feger, Macquarie Univ. (Australia)
Michael J. Ireland, The Australian National Univ. (Australia)
Joao Bento, Macquarie Univ. (Australia)
Carlos Bacigalupo, Macquarie Univ. (Australia)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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