@inproceedings{de7111c6fb4c4b209f2651150e55c44d,
title = "A stable and inexpensive wavelength reference for precise wavelength calibration of radial velocity spectrographs",
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.",
keywords = "Wavelength scale reference, fiber Mach-Zehnder interferometer, phase locking, radial velocity",
author = "Tobias Feger and Ireland, {Michael J.} and Joao Bento and Carlos Bacigalupo",
note = "Publisher Copyright: {\textcopyright} 2014 SPIE.; Ground-Based and Airborne Instrumentation for Astronomy V ; Conference date: 22-06-2014 Through 26-06-2014",
year = "2014",
doi = "10.1117/12.2055674",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ramsay, {Suzanne K.} and McLean, {Ian S.} and Hideki Takami",
booktitle = "Ground-Based and Airborne Instrumentation for Astronomy V",
address = "United States",
}