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)‡

Time series of the stabilized beat frequency recorded over 1.6 hours with frequency counter. The red line is the free-running beat frequency. The blue line shows the beat signal phase-locked to the reference synthesizer at 80 MHz.