Astro-comb calibrator and spectrograph characterization using a turn-key laser frequency comb

Abstract

Using a turn-key Ti:sapphire femtosecond laser frequency comb, an off-the-shelf supercontinuum device, and Fabry-Perot mode filters, we report the generation of a 16 GHz frequency comb spanning a 90 nm band about a center wavelength of 566 nm. The light from this astro-comb is used to calibrate the HARPS-N astrophysical spectrograph for precision radial velocity measurements. The comb-calibrated spectrograph achieves a stability of $\sim$ 1 cm/s within half an hour of averaging time. We also use the astro-comb as a reference for measurements of solar spectra obtained with a compact telescope, and as a tool to study intrapixel sensitivity variations on the CCD of the spectrograph.

arXiv comment9 pages, 6 figures

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Cited by in corpus (4)

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• Visible-spanning flat supercontinuum for astronomical applications
• Erbium-doped-fiber-based broad visible range frequency comb with a 30 GHz mode spacing for astronomical applications