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

摘要

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