A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy*
Hou Leia), Han Hai-Niana)†, Wang Weib), Zhang Longa), Pang Li-Huia), Li De-Huaa), Wei Zhi-Yia)‡
       
The side-mode suppression rate as a function of FSR of astro-comb with different filter systems based on a 250-MHz repetition rate of the Yb:fiber comb. The squares show side-mode suppression with a single FPC. The circles show results of two identical FPCs. The triangles show suppression with a different FSR of the first filter cavity in the series.