High power wide Raman combs in picosecond-laser pumped H2-filled inhibited coupling kagome fibers

We report on the generation of wide Raman combs with over-five octaves bandwidth from the UV at 300 nm to the long-wavelength infrared at 12.5 μm. These combs are generated via transient stimulated Raman scattering in H₂-filled inhibited coupling (IC) Kagome Hollow-Core Photonic Crystal Fiber pumped with high power picosecond fiber laser with several spectral lines and with an output average power of up to ~10 W. We demonstrate that by selective generation of Raman line that the current set-up can be used to develop high power fiber lasers at non-conventional wavelength outside the bandwidth emissions of the rare earth. As an example, we generated laser emission at 1.8 μm with average power as high as 9.3 W, corresponding to a quantum efficiency of 75%.