A near-infrared Fabry-Pérot for Fourier-transform spectrograph calibration
- 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 .
| Author: | Philipp HukeORCiD, M. Debus, Sebastian Schäfer, A. Reiners |
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| DOI: | https://doi.org/10.1117/12.2629912 |
| Parent Title (English): | Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal (Québec, Canada) |
| Document Type: | Conference Proceeding |
| Language: | English |
| Year of Completion: | 2022 |
| Release Date: | 2025/03/03 |
| Tag: | Fourier-transform spectrograph calibration |
| Volume: | 12184 |
| Pagenumber: | 13 |
| Institute: | Fachbereich Technik |
| Research Focus Area: | Nachhaltige Technologien und Prozesse |