Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction

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Saerchen, E.; Liedtke-Gruener, S.; Kopp, M. et al.: Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction. In: PLoS ONE 14 (2019), Nr. 9, e0222293. DOI: https://doi.org/10.1371/journal.pone.0222293

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Sum total of downloads: 107

In the area of laser material processing, versatile applications for cutting glasses and transparent polymers exist. However, parasitic effects such as the creation of step-like structures appear when laser cutting inside a transparent material. To date, these structures were only described empirically. This work establishes the physical and chemical mechanisms behind the observed effects and describes the influence of process and material parameters onto the creation of step-like structures in hydrogel, Dihydroxyethylmethacrylat (HEMA). By focusing laser pulses in HEMA, reduced pulse separation distance below 50 nm and rise in pulse energy enhances the creation of unintended step-like structures. Spatial resolved Raman-spectroscopy was used to measure the laser induced chemical modification, which results into a reduced breakdown threshold. The reduction in threshold influences the position of optical breakdown for the succeeding laser pulses and consequently leads to the step-like structures. Additionally, the experimental findings were supplemented with numerical simulations of the influence of reduced damage threshold onto the position of optical breakdown. In summary, chemical material change was defined as cause of the step-like structures. Furthermore, the parameters to avoid these structures were identified.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 51 47.66%
2 image of flag of United States United States 28 26.17%
3 image of flag of China China 13 12.15%
4 image of flag of No geo information available No geo information available 3 2.80%
5 image of flag of Russian Federation Russian Federation 2 1.87%
6 image of flag of Portugal Portugal 2 1.87%
7 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 1.87%
8 image of flag of Korea, Republic of Korea, Republic of 1 0.93%
9 image of flag of France France 1 0.93%
10 image of flag of Canada Canada 1 0.93%
    other countries 3 2.80%

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