28 July 2014 Optical cavity characterization of the Tor Vergata Fabry-Pérot interferometer
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We report the first optical and control performances of the Tor Vergata Fabry-P´erot interferometer prototype designed and realized in the framework of the ADvanced Astronomy for HELIophysics (ADAHELI) solar mission project. The characterization of the the coated surfaces of the two plates defining the optical cavity has been carried out with a Zygo interferometer able to measure the microroughness and global curvature of the cavity. The peak-to-valley errors are compliant with the manufacturer specifications and correspond to λ/70 and λ/80 @632.8 nm respectively. In addition, we present a first estimate of the interferometer spectral stability in stable open-air condition. A spectral uncertainty equal to 0.95 pm is found as the typical RMS over one hour of the passband central wavelength position.
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Luca Giovannelli, Luca Giovannelli, Francesco Berrilli, Francesco Berrilli, Dario Del Moro, Dario Del Moro, Vincenzo Greco, Vincenzo Greco, Roberto Piazzesi, Roberto Piazzesi, Andrea Sordini, Andrea Sordini, Marco Stangalini, Marco Stangalini, "Optical cavity characterization of the Tor Vergata Fabry-Pérot interferometer", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914782 (28 July 2014); doi: 10.1117/12.2056477; https://doi.org/10.1117/12.2056477

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