We report on an on-field CO2 sensing experiment based on a rapidly modulated optical parametric oscillator (OPO). This OPO is pumped by a mode-locked fibre laser source delivering 120 ps pulse laser with a spectral width of about 0.03 nm at a repetition frequency of 40 MHz and an average power of 5W. The output wavelength of the fibre laser pump source can be rapidly modulated resulting in a modulated mid-IR signal. This modulated signal around 2.7 μm was used for CO2 detection during a field experiment by a deported (~100m) sampling method.
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