Efficient 1.9 μm emission in H-filled hollow core fiber by pure stimulated vibrational Raman scattering

Z. Wang, F. Yu, W.J. Wadsworth, J.C. Knight

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/7c4dad5c-ae81-47e8-9bf9-62e7229ed847 • DOI: https://doi.org/10.1088/1612-2011/11/10/105807

We report here efficient 1.9 μm emission by pure stimulated vibrational Raman scattering in a hydrogen-filled anti-resonant hollow-core fiber pumped with a 1064 nm microchip laser. A maximum quantum conversion efficiency ∼48% was achieved by using a 6.5 m length of fiber filled with 23 bar hydrogen, with a maximum peak output power >2 kW. By properly designing the transmission bands of the fiber, selecting alternative pump sources and active gases, the emission wavelength could be extended into the mid-infrared. This provides a potential route for generating efficient, compact, broadly tunable, high power, and narrow linewidth mid-infrared fiber gas lasers with broad application in defense, environmental, and medical monitoring.