A near-infrared Fabry-Pérot for Fourier-transform spectrograph calibration

M. Debus; S. Schäfer; P. Huke; A. Reiners

doi:10.1117/12.2629912

29 August 2022 A near-infrared Fabry-Pérot for Fourier-transform spectrograph calibration

M. Debus, S. Schäfer, P. Huke, A. Reiners

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121844U (2022) https://doi.org/10.1117/12.2629912
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The Solar observatory at the Institute for Astrophysics and Geophysics Göttingen makes use of the ultra-high resolving power (R < 900, 000 at 600 nm) of a Fourier transform spectrograph (FTS) to obtain spectra of the resolved and integrated Sun. To improve the radial velocity (RV) stability of the FTS measurements we develop a new calibration unit based on a passively stabilized Fabry-Pérot Etalon (FP) (FSR= 3.6 GHz and F ≈ 7) for simultaneous calibration in the near-infrared. The FP is illuminated by two LEDs, covering the wavelength range from 800 to 1000 nm. To mitigate environmental effects, the FP is placed in a temperature and pressure controlled vessel. We explore the impact of the choice of input fiber as well as fiber coupler focal length on the calibration spectrum. In 150 laser frequency comb calibrated measurements over 8 hours we achieve an an RMS of the FP-RV of 0.58 m s⁻¹ .

Citation Download Citation

M. Debus, S. Schäfer, P. Huke, and A. Reiners "A near-infrared Fabry-Pérot for Fourier-transform spectrograph calibration", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121844U (29 August 2022); https://doi.org/10.1117/12.2629912

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