Benedick, Andrew J., Guoqing Chang, Jonathan R. Birge, Li-Jin Chen, Alexander G. Glenday, Chih-Hao Li, David F. Phillips, et al. 2010. Visible Wavelength Astro-Comb. Optics Express 18, no. 18: 19175-19184.
We demonstrate a tunable laser frequency comb operating near 420 nm with mode spacing of 20-50 GHz, usable bandwidth of 15 nm and output power per line of ~20 nW. Using the TRES spectrograph at the Fred Lawrence Whipple Observatory, we characterize this system to an accuracy below 1m/s, suitable for calibrating high-resolution astrophysical spectrographs used, e.g., in exoplanet studies.