Plasma strings from ultraviolet laser filaments drive permanent structural modifications in fused silica.
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Long self-trapped femtosecond ultraviolet filaments created in the bulk of pure fused silica are used to induce permanent structural changes in the medium. We monitor the laser pulse propagation as a filamentary structure and the plasma string left at its trail. We investigate and demonstrate the link of the filament-induced plasma to the permanent structural changes left in the medium. Specific electron density thresholds are found for the induced modifications.
author list (cited authors)
Papazoglou, D. G., Zergioti, I., & Tzortzakis, S.