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Proceedings Paper

In-water fiber-optic evanescent wave sensing in the mid-infrared
Author(s): Paul Chevalier; Marco Piccardo; Federico Capasso
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Paper 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.

Paper Details

Date Published: 2 March 2020
PDF: 6 pages
Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 1128711 (2 March 2020); doi: 10.1117/12.2548135
Show Author Affiliations
Paul Chevalier, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Marco Piccardo, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Federico Capasso, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)


Published in SPIE Proceedings Vol. 11287:
Photonic Instrumentation Engineering VII
Yakov Soskind; Lynda E. Busse, Editor(s)

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