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) . Consequently, material absorption losses play a minor role in the mid-IR in a few meter-long silica-based IC-HCPCF as demonstrated previously . This suggests that the concept of hollow fiber gas laser (HOFGLAS), which was demonstrated in the visible with I2  and at 3 µm with C2H2 pulsed  and CW , can be extended to longer wavelengths. Here, we report on an optically pumped gas-laser based on N2O-filled IC-HCPCF. The pulsed N2O HOFGLAS is pumped at 1.517 µm and emits at 4.6 µm with a photon conversion efficiency of 9% and a slope efficiency of 3%.
Mid-IR HCPCF gas-laser emitting at 4.6 μm / Gerome, F.; Aghbolagh, F.; Nampoothiri, V.; Debord, B.; Vincetti, L.; Benabid, F.; Rudolph, W.. - 2019:(2019), pp. 1-1. (Intervento presentato al convegno 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019 tenutosi a Munich, Germany nel 2019) [10.1109/CLEOE-EQEC.2019.8872730].