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Here, we use a compact gas cavity based on anti-resonance hollow-core fiber (HCF) for trace gas detection. Since there are lots of characteristic absorption lines (P and R branch) of CO2 molecule in 2 μm band, we used a self-made 2 μm fiber amplifier seeded by a precisely tunable narrow linewidth diode laser as the detection light source. The absorption characteristics of R(26), R(28), R(30) and R(32) at different CO2 pressure are measured and analyzed. This work provides a potential cost-effective method for the high-precision detection of trace gas.
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Jun Li, Hao Li, Hongye Li, Zefeng Wang, "Detection of greenhouse gas CO2 by gas cell based on anti-resonance hollow-core fiber," Proc. SPIE 11850, First Optics Frontier Conference, 118500P (18 June 2021); https://doi.org/10.1117/12.2599506