Towards trace gases detection in the UV range by coupling Dual Comb Spectroscopy and Integrated Path Lidar

Detecting reactive traces gases in the atmosphere requires fast acquisition time and in-situ probing without air sampling. Several trace gases present a maximum absorption cross-section in the ultraviolet (UV) range, which call for a spectrally-resolved spectroscopy technique with a fast acquisition rate in this range to detect them. The Dual Comb Spectroscopy (DCS) technique meets these requirements. We present a DCS setup using a homemade bidirectional Ti:Sa laser cavity in the infrared (IR) range and use Second Harmonic Generation (SHG) to extend it to the UV range. We use O2 detection to quantitatively characterize the setup in the IR range and show preliminary UV-DCS interferograms.