A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy<xref ref-type="fn" rid="cpb141239fn1">*</xref>

A 23.75-GHz frequency comb with two low-finesse filtering cavities in series for high resolution spectroscopy*

Hou Lei^a), Han Hai-Nian^a)†, Wang Wei^b), Zhang Long^a), Pang Li-Hui^a), Li De-Hua^a), Wei Zhi-Yi^a)‡

The comb output spectrum (linear scale) after the two filter cavities, respectively. The optical spectrum analyzer’s resolution is set at about 5 GHz. (a) The spectrum with 4.75-GHz line spacing. (b) The spectrum with 23.75-GHz line spacing. To assess the mode feature of the spectrum, the inset figure is shown.