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2 March 2020 In-water fiber-optic evanescent wave sensing in the mid-infrared
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Water is always at risk of accidental or intentional pollution that would consist of introducing a harmful chemical into a drinking water reservoir. Fiber-optics evanescent wave sensing has been shown to be an efficient sensor scheme for direct in-water sensing. Here we demonstrate a system for the detection of chemicals dissolved in water by using quantum cascade lasers (QCLs) coupled into a silver halide fiber. The study was performed over two frequency ranges: short wavelength (i.e. 3µm and 5µm) and long wavelength (between 8µm and 10µm) and using two different types of QCL source: pulsed and continuous wave.
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Paul Chevalier, Marco Piccardo, and Federico Capasso "In-water fiber-optic evanescent wave sensing in the mid-infrared", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 1128711 (2 March 2020);

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