4 August 2016 Measuring the thermal sensitivity of a fiber Fabry-Pérot interferometer
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We introduce a general technique for frequency stability characterization of Fabry-Perot etalons that are being explored for astronomical spectrograph calibration. In our approach a frequency-stabilized laser frequency comb is employed as a reference for a scanning CW laser measurement of the temperature sensitivity of a fiber Fabry-Perot interferometer (FFP). For an in-house constructed, actively stabilized FFP, we observe the thermal sensitivity of a resonance mode at 1319 nm of ∼7.4 GHz C−1, which corresponds to a fractional thermal sensitivity of ∼3.2 × 10−5 C−1. We compare these results to a simple model and discuss further the materials construction and stabilization of the FFP. Our measurement technique is one step toward a broad characterization of Fabry-Perot instruments, and this FFP in particular is currently being investigated as a wavelength calibration source in precision radial velocity spectroscopy to discover terrestrial-mass exoplanets.
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Jeff Jennings, Jeff Jennings, Samuel Halverson, Samuel Halverson, Scott A. Diddams, Scott A. Diddams, Ryan Terrien, Ryan Terrien, Gabriel Ycas, Gabriel Ycas, Suvrath Mahadevan, Suvrath Mahadevan, "Measuring the thermal sensitivity of a fiber Fabry-Pérot interferometer", Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99072G (4 August 2016); doi: 10.1117/12.2231053; https://doi.org/10.1117/12.2231053

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