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A compact trace gas sensor which incorporated a compact cylindrical thin-disk multi-pass cell was developed. An optical path length could be selected easily in a small absorption volume across the beam path of 25 cm3 .
We successfully demonstrated NO2 detection based on differential absorption cavity ringdown spectroscopy using a dual wavelength passively locked external cavity diode laser. Selective trace NO2 detection was achieved in a 2 ml compact ringdown cell.
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