Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis
AbstractWe report on the dynamic behavior of dual-wavelength distributed feedback (DFB) quantum cascade lasers (QCLs) in continuous wave and intermittent continuous wave operation. We investigate inherent etaloning effects based on spectrally resolved light-current-voltage (LIV) characterization and perform time-resolved spectral analysis of thermal chirping during long (>5 µs) current pulses. The theoretical aspects of the observed behavior are discussed using a combination of finite element method simulations and transfer matrix method calculations of dual-section DFB structures. Based on these results, we demonstrate how the internal etaloning can be minimized using anti-reflective (AR) coatings. Finally, the potential and benefits of these devices for high precision trace gas analysis are demonstrated using a laser absorption spectroscopic setup. Thereby, the atmospherically highly relevant compounds CO2 (including its major isotopologues), CO and N2O are simultaneously determined with a precision of 0.16 ppm, 0.22 ppb and 0.26 ppb, respectively, using a 1-s integration time and an optical path-length of 36 m. This creates exciting new opportunities in the development of compact, multi-species trace gas analyzers. View Full-Text
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Süess, M.J.; Hundt, P.M.; Tuzson, B.; Riedi, S.; Wolf, J.M.; Peretti, R.; Beck, M.; Looser, H.; Emmenegger, L.; Faist, J. Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis. Photonics 2016, 3, 24.
Süess MJ, Hundt PM, Tuzson B, Riedi S, Wolf JM, Peretti R, Beck M, Looser H, Emmenegger L, Faist J. Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis. Photonics. 2016; 3(2):24.Chicago/Turabian Style
Süess, Martin J.; Hundt, P. M.; Tuzson, Béla; Riedi, Sabine; Wolf, Johanna M.; Peretti, Romain; Beck, Mattias; Looser, Herbert; Emmenegger, Lukas; Faist, Jérôme. 2016. "Dual-Section DFB-QCLs for Multi-Species Trace Gas Analysis." Photonics 3, no. 2: 24.
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