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SPR carbon dioxide sensor
The team used a 4.4 micron quantum cascade laser (QCL) that emitted a strongly TM-polarised beam. Light from the QCL is fired into a calcium fluoride prism, which is coated with titanium-gold active layer. The reflected beam exits the prism where it is focused into an MCT detector. (Image credit: Sylvain Herminjard, EPFL)
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