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Fig. 5 | PhotoniX

Fig. 5

From: Passive coherent dual-comb spectroscopy based on optical-optical modulation with free running lasers

Fig. 5

Dual comb spectra of the gas mixture. a) The spectra obtained from two independent measurements, recording 50 s and averaged. The gas cell is 4.8-m-long and filled with approximately 450 mbar CO, 200 mbar CO2 and 1.8 mbar C2H2. b) Comparison between the extracted absorption lines (blue line) and the theoretical result (red line) computed based on HITRAN database. c) Portions of the absorption lines for different gases. The measurement absorption intensity agrees well with the theoretical (red lines)

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