8 July 2014 Single-lock: a stable Fabry-Perot based wavelength calibrator
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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