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)‡

(a) Free-running beat frequency between CW laser and one mode of the comb around 1045 nm, measured with a sweep time 4 ms (RBW: 100 kHz). (b) Beat frequency phase-locked to a reference synthesizer at 80 MHz (RBW: 10 kHz). The inset shows the peak with a strong signal-to-noise radio and a linewidth that is limited by the smallest instrumental resolution bandwidth of 1 Hz.