Atmospheric Traces Sensor Based on Visible Dual-Comb Spectroscopy Using Ti:sapphire Mode-locked Lasers

SummaryWe propose a sensor scheme for atmospheric compositions analysis based on visible dual-comb spectroscopy. These combs are originated from Ti:sapphire mode-locked resonators, and with the spectrums spread, they cover 600-1000 nm band, which corresponds to the wavelength of absorption spectra of some trace gases such as NO
3
and O
2
. The beat note between two combs proved that the spectrum resolution of the sensor reaches 0.00012 nm and the acquisition time reaches 0.085 microseconds.