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Coherent ultraviolet (UV) light has many uses, for example in the study ofmolecular species relevant in biology and chemistry. Very few if any lasermaterials offer UV transparency along with damage-free operation at high photonenergies and laser power. Here we report efficient generation of deep andvacuum UV light using hydrogen-filled hollow-core photonic crystal fiber(HC-PCF). Pumping above the stimulated Raman threshold at 532 nm, coherentmolecular vibrations are excited in the gas, permitting highly efficientthresholdless wavelength conversion in the UV. The system is uniquelypressure-tunable, allows spatial structuring of the out-coupled radiation, andshows excellent performance in the vacuum UV. It can also in principle operateat the single-photon level, when all other approaches are extremelyinefficient.

Thresholdless deep and vacuum ultraviolet Raman frequency conversion in H$_2$-filled photonic crystal fiber