Broadband near-infrared astronomical spectrometer calibration and on-sky validation with an electro-optic laser frequency comb
- Obrzud, E.
- RAINER, Monica
- Harutyunyan, A.
- Chazelas, B.
- Cecconi, M.
- Ghedina, A.
- MOLINARI, Emilio Carlo
- Kundermann, S.
- Lecomte, S.
- Pepe, F.
- Wildi, F.
- Bouchy, F.
- Herr, T.
DOIAbstract
The quest for extrasolar planets and their characterisation as well as studies of fundamental physics on cosmological scales rely on capabilities of high-resolution astronomical spectroscopy. A central requirement is a precise wavelength calibration of astronomical spectrographs allowing for extraction of subtle wavelength shifts from the spectra of stars and quasars. Here, we present an all-fibre, 400 nm wide near-infrared frequency comb based on electro-optic modulation with 14.5 GHz comb line spacing. Tests on the high-resolution, near-infrared spectrometer GIANO-B show a photon-noise limited calibration precision of <10 cm/s as required for Earth-like planet detection. Moreover, the presented comb provides detailed insight into particul...
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