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Development of trace gas sensors based on mid-infrared interband cascade lasers and quantum cascade lasers as well as their applications will be reported. The sensor technology will use both laser absorption and quartz enhanced photoacoustic spectroscopy.
The paper presents construction of broadband optical system devoted to free space optical communication using long wavelength quantum cascade laser and a heterostructural thermally cooled HgCdTe photodetector. This system should characterize with lower sensitivity to adverse meteorological conditions when compared with the systems operating in near IR.
The paper presents application of cavity enhanced absorption spectroscopy (CEAS) technique for nitrogen dioxide (NO2) detection. The setup includes the resonance optical cavity, build with spherical and high reflectance mirrors. As a light source a pulsed blue diode laser is used (414 nm). The signal is registered by a photomultiplier connected to the digital oscilloscope.
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