8 July 2014 Single-lock: a stable Fabry-Perot based wavelength calibrator
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Abstract
Pushing the RV technique to the precision required to detect Earth-like planets around Solar-type stars requires extreme stability in the wavelength calibrator. We are developing a wavelength calibration technique based on a Fabry-Perot interferometer locked to a stabilized laser. This approach offers advantages over other methods: it produces a broadband, emission comb output from 380-790 nm that is difficult to achieve with a laser frequency comb; by injecting into the science fibers before and after observations, weak signals from velocities in the stellar photosphere that would be masked by iodine reference lines can be now be identified; and by locking the laser to an atomic transition, the spectrum will be stabilized to better than 1 part in 10 e-11, corresponding to a wavelength solution that is known to better than 1 cms-1.
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T. M. McCracken, T. M. McCracken, C. A. Jurgenson, C. A. Jurgenson, D. A. Fischer, D. A. Fischer, R. A. Stoll, R. A. Stoll, A. E. Szymkowiak, A. E. Szymkowiak, J. Bradford, J. Bradford, W. Rutter, W. Rutter, "Single-lock: a stable Fabry-Perot based wavelength calibrator", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91473L (8 July 2014); doi: 10.1117/12.2056488; https://doi.org/10.1117/12.2056488
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