In-water fiber-optic evanescent wave sensing in the mid-infrared

Paul Chevalier; Marco Piccardo; Federico Capasso

doi:10.1117/12.2548135

2 March 2020 In-water fiber-optic evanescent wave sensing in the mid-infrared

Paul Chevalier, Marco Piccardo, Federico Capasso

Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 1128711 (2020) https://doi.org/10.1117/12.2548135
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.2548135

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