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Updated: May 19, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
Black-light continuum generation in a silica-core photonic crystal fiber
T Sylvestre1, A R Ragueh, M W Lee
1Institut FEMTO-ST, Département d’Optique P M Duffieux, Université de Franche-Comté, CNRS, Besançon, France. thibaut.sylvestre@univ‐fcomte.fr
Abstract:
We report the observation of a broadband continuum spanning from 350 to 470 nm in the black-light region of the electromagnetic spectrum as a result of picosecond pumping a solid-core silica photonic crystal fiber at 355 nm. This was achieved despite strong absorption and a large normal dispersion of silica glass in the UV. Further investigations reveal that the continuum generation results from the interplay of intermodally phase-matched four-wave mixing and cascaded Raman scattering. We also discuss the main limitations in terms of bandwidth and power due to temporal walk-off, fiber absorption, and the photo darkening effect, and we suggest simple solutions.
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