0587567 - FZÚ 2025 RIV US eng J - Článek v odborném periodiku
Zukerstein, Martin - Zhukov, Vladimir - Derrien, Thibault - Fedotova, O. - Bulgakova, Nadezhda M.
Double-pulse-laser volumetric modification of fused silica: the effect of pulse delay on light propagation and energy deposition.
Optics Express. Roč. 32, č. 7 (2024), s. 12882-12891. ISSN 1094-4087
Grant CEP: GA MŠMT EF15_003/0000445
GRANT EU: European Commission(XE) 823897 - ATLANTIC
Institucionální podpora: RVO:68378271
Klíčová slova: double-pulse-laser * volumetric modification * modification * fused silica * effect of pulse delay * light propagation * energy deposition * supplement
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 3.2, rok: 2023 ; AIS: 0.723, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1364/OE.515766

Volumetric modification of dielectrics by ultrashort laser pulses is a complex dynamic phenomenon involving material photoexcitation and associated nonlinear processes. To achieve control over modification, it is necessary to gain a deep insight into the dynamics of laser-excited processes that can be realized using double-laser-pulse experiments with different time separations supported by numerical simulations. In this paper, we apply this approach to investigate fused silica modification with femtosecond laser pulses that provides time-resolved information about the dynamic behavior of the laser-excited bandgap material. It is shown that the laser-generated free-electron plasma causes a shielding effect for the following pulse with a characteristic duration of ∼600 fs after the pulse action. Within this time interval, the second pulse produces a reduced modification as compared to a longer time separation between pulses. For double pulses with different energies, it was found that the volumetric modification is stronger when a lower-energy pulse couples with material first. This is explained by the combination of the effects of the re-excitation of self-trapped excitons, which are generated as a result of free electron recombination and associated light shielding. Experimental results are supported by numerical simulations of double laser pulse propagation in nonlinear media based on Maxwell’s equations. Our findings offer a route for better controlling the inscription of 3D photonic structures in bulk optical materials.
Trvalý link: https://hdl.handle.net/11104/0354700