title: High-quality ultraviolet beam generation in multimode photonic crystal fiber through nondegenerate four-wave mixing at 532 nm.
abstract: All-fiber ultraviolet (UV) light sources are of great practical interest for a multitude of applications spanned across different sectors, from industrial processes such as nonthermal, high-resolution materials processing, to biomedical applications such as eye surgery, to name a few. However, production of UV light sources with high beam quality has been a problem to this day as the fiber designs required to reach UV wavelengths by four-wave mixing with widely available pumps (i.e., 532 nm) are challenging because of their small size and increased risk of material damage. In this Letter, a specific pumping scheme is presented that allows the conversion of two pump photons in different modes to UV light in the fundamental mode and the corresponding idler in a higher order mode. The process has also been shown to work experimentally, and UV light at 390.5 nm in the fundamental mode was successfully generated.
authors.forename: Benoit
authors.initials: B
authors.lastname: Sévigny
authors.forename: Andy
authors.initials: A
authors.lastname: Cassez
authors.forename: Olivier
authors.initials: O
authors.lastname: Vanvincq
authors.forename: Yves
authors.initials: Y
authors.lastname: Quiquempois
authors.forename: Géraud
authors.initials: G
authors.lastname: Bouwmans
mesh_terms: D055100:Optical Fibers; D055620:Optical Phenomena; D017785:Photons; D014466:Ultraviolet Rays