Abstract
We report on a quartz-enhanced photoacoustic (QEPAS) sensor employing a monolithic distributed-feedback quantum cascade laser array operating in a pulsed mode as a light source. The array consists of 32 quantum cascade lasers emitting in a spectral range from 1190 cm<sup>-1</sup> to 1340 cm<sup>-1</sup>, which covers two absorption branches of nitrous oxide (N<sub>2</sub>O) and several absorption features of (CH<sub>4</sub>). The versatility of the QEPAS technique combined with the rapid wavelength tuning provided by the ultra-compact, low-power consuming laser source allowed the detection of N<sub>2</sub>O and CH<sub>4</sub> with detection sensitivities below a part-per-million at atmospheric pressure.
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