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The development of quantum cascade lasers (QCLs), interband cascade lasers (ICLs), and advanced infrared detectors has significantly expanded the capabilities of optical gas sensing, offering a 2–3 fold improvement in sensitivity over traditional NIR techniques. Compared to other analytical methods such as non-dispersive gas chromatography or Fourier transform infrared (FTIR) spectroscopy, TDLAS provides superior sensitivity and faster response times. The development of a compact lightweight and sensitive gas sensor certainly accounts for the novelty and if competitively priced, the sensor could readily be taken up for commercialization.