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).
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