Abstract

Strong ro-vibrational transitions of molecules in the mid-infrared wavelength region, coupled with fast data acquisition of dual-comb spectroscopy (DCS), yields an effective tool for time-resolved simultaneous monitoring of the concentrations of different species involved in a gas-phase chemical reaction [1]. Here we used the broadband and high resolution properties of mid-infrared DCS, to monitor the static and dynamic concentrations of methane and the reaction products, in an electrical discharge. The mid-infrared dual comb source is based on an optical parametric oscillator (OPO) in a singly resonant cavity configuration, containing two temperature stabilized, 5 mm long, MgO: PPLN crystals.

© 2019 IEEE