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1 April 2020 Laser absorption spectroscopy and gas sensing near 4.5 μm inside antiresonant hollow core fiber
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Abstract
We present laser-based spectroscopy in the mid-infrared spectral region inside novel anti-resonant (AR) hollow core fiber (HCF). AR-HCF used in this work has small (few dB/m) attenuation near 4 µm and exceptionally small bending losses. This gives perspective for compact all-fiber-based mid-infrared chemical sensors with optical path lengths of several meters. For gas sensing demonstration, a distributed feed-back (DFB) quantum cascade laser (QCL) operating near 4.54 μm and a 3.2-m-long fiber were used to detect nitrous oxide (N2O) and carbon monoxide (CO) using direct laser absorption spectroscopy (DLAS) and wavelength modulation spectroscopy (WMS).
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michal Nikodem, Grzegorz Gomólka, Mariusz Klimczak, Dariusz Pysz, and Ryszard Buczyński "Laser absorption spectroscopy and gas sensing near 4.5 μm inside antiresonant hollow core fiber", Proc. SPIE 11354, Optical Sensing and Detection VI, 113540N (1 April 2020); https://doi.org/10.1117/12.2555167
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