Dispersion-managed dual-comb laser and measurement of absorption spectroscopy

Dual-comb spectroscopy with high resolution has attracted increasing attention in spectral analysis. Compact dual-comb systems based on single-cavity mode-locked lasers hold promising potential for further simplifying dual-comb spectroscopy. Herein, we proposed an all-fiber dispersion-managed dual-comb laser with a 3 dB bandwidth of ∼9 nm. Dual-comb spectroscopy was performed based on the free-running dual-comb laser, where tooth-resolved absorption spectra of hydrogen cyanide were realized. The 9 absorption lines at 1560 nm measured by dual-comb spectroscopy were in line with the HITRAN database. Subtle changes in transmittance at a temperature change of 5 ^∘C were resolved by such dual-comb system. The results demonstrate that such kind of dual-comb spectrometer can be considered as a potential candidate for low-cost, simple-structured gas sensors.