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A continuous-filtering Vernier spectrometer based on an Er:fiber femtosecond laser was developed to acquire broadband H2O and OH spectra in a premixed CH4/air flame with 25 ms time resolution and percent precision on concentrations retrieval.

We demonstrate a high-temperature water absorption spectrum measured in a flame using cavity-enhanced frequency comb-based Fourier transform spectroscopy. The retrieved transition intensities and frequencies are assigned using the POKAZATEL line list.

We demonstrate detection of broadband high-temperature water spectra in a laminar, premixed methane/air flat flame using high-resolution near-infrared cavity-enhanced optical frequency comb spectroscopy incorporating a fast-scanning Fourier transform spectrometer.

Calibration-free wavelength modulation spectroscopy was employed for measuring temperature and H2O concentration in combustion environments with a near-infrared DFB-laser, and for detection of CO in human breath using a quantum cascade laser.

A compact NICE-OHMS spectrometer based on a narrowband fiber laser has been used for detection of C2H2down to an integrated absorption of 5×10-11cm-1in Doppler-broadened and 3×10-10cm-1in Doppler-free mode of operation.