Infrared laser sources emitting in the atmospheric transmission window (i.e. the wavelength range of 3-5 μm and 8-13 μm) are of interest in applications such as remote sensing, imaging and free-space communications . Within this context, Inhibited Coupling Hollow Core Photonic Crystal Fibers (IC-HCPCF)  offer an interesting platform for gas laser sources, especially for those emitting in spectral ranges where silica-based solid core fiber lasers fail because of the large infrared (IR) absorption losses of the host materials. Indeed, the possibility of filling HCPCF with gases, and combining long gas-light interaction lengths with small modal areas opened new avenues for laser development and nonlinear optics . Furthermore, IC-HCPCFs exhibit particularly weak optical overlap between the guided field and the glass cladding material (typically in the range 10-4-10-6) .
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