Add time:08/11/2019         Source:sciencedirect.com

Currently available semiconductor lasers for spectroscopy in the near- and mid-infrared region based on direct band-to-band transitions as gallium-arsenide, indium-phosphide, antimonides and lead-salt containing compounds will be discussed together with the main features of different tunable diode-laser absorption spectrometers for trace gas analysis. Measurements of atmospheric carbon dioxide with a room-temperature 2 μm indium-phosphide laser, applications of antimonide lasers for methane and formaldehyde sensing in the 3–4 μm range and a fast chemical sensor for methane flux measurements based on lead-salt diode-lasers operating near 7.8 μm will be presented.

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