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Double-pulse-laser volumetric modification of fused silica: the effect of pulse delay on light propagation and energy deposition
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SYSNO ASEP 0587567 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Double-pulse-laser volumetric modification of fused silica: the effect of pulse delay on light propagation and energy deposition Author(s) Zukerstein, Martin (FZU-D) ORCID
Zhukov, Vladimir (FZU-D) ORCID
Derrien, Thibault (FZU-D) ORCID
Fedotova, O. (BY)
Bulgakova, Nadezhda M. (FZU-D) ORCID, RIDNumber of authors 5 Source Title Optics Express. - : Optical Society of America - ISSN 1094-4087
Roč. 32, č. 7 (2024), s. 12882-12891Number of pages 10 s. Language eng - English Country US - United States Keywords double-pulse-laser ; volumetric modification ; modification ; fused silica ; effect of pulse delay ; light propagation ; energy deposition ; supplement Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects EF15_003/0000445 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 001206868200004 EID SCOPUS 85189007185 DOI https://doi.org/10.1364/OE.515766 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2025 Electronic address https://hdl.handle.net/11104/0354700
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