Experimental and numerical investigation of coiling-induced effects in an antiresonant hollow-core fiber for compact mid-infrared gas absorption cells

The following files include data presented in the manuscript “Experimental and numerical investigation of coiling-induced effects in an antiresonant hollow-core fiber for compact mid-infrared gas absorption cells,” written by Piotr Bojęś, Piotr Jaworski, Dakun Wu, Karol Krzempek, Grzegorz Soboń and and Fei Yu.Figure 2. Average power of the ARHCF-delivered mid-IR OFC registered for different coiling radii of the fiber andcalculated average coiling-induced loss in the ARHCF for different coiling radii of the fiber. Figure 3. Average power of the ARHCF-delivered mid-IR OFC registered for different coiling radii of the fiber and calculated average coiling-induced loss for different coiling radii of the fiber. Figure 5. Coiling-induced loss for each considered coiling radius of the ARHCF within the 3100 - 3400 nm bandwidth.Figure 6. Coiling-induced loss in the ARHCF over 3100 - 3400 nm bandwidth obtained from COMSOL numerical simulations. Figure 7. Comparison of the average coiling-induced loss for simulations and measurements in 3100 – 3400 nm band. Figure 8. Upper plot: absorption spectrum of 15 ppmv CH4 measured in the 25.1 m ARHCF coiled with 118 mm coiling radii, plotted against the reference transmission spectrum of the ARHCF filled with pure N2. Lower plot: HITRAN-based simulations of the absorption spectrum of 15 ppmv CH4 at 790 Torr pressure within 25.1 m optical path length. Figure 9. Upper plot: absorption spectrum of 15 ppmv CH4 measured in the 25.1 m ARHCF coiled with 98 mm coiling radii, plotted against the reference transmission spectrum of the ARHCF filled with pure N2. Lower plot: HITRAN-based simulations of the absorption spectrum of 15 ppmv CH4 at 790 Torr pressure within 25.1 m optical path length. (2026-04)