Cargando…

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

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 empirica...

Descripción completa

Detalles Bibliográficos
Autores principales: Saerchen, Emanuel, Liedtke-Gruener, Susann, Kopp, Maximilian, Heisterkamp, Alexander, Lubatschowski, Holger, Ripken, Tammo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6748420/
https://www.ncbi.nlm.nih.gov/pubmed/31527880
http://dx.doi.org/10.1371/journal.pone.0222293
_version_ 1783452085292892160
author Saerchen, Emanuel
Liedtke-Gruener, Susann
Kopp, Maximilian
Heisterkamp, Alexander
Lubatschowski, Holger
Ripken, Tammo
author_facet Saerchen, Emanuel
Liedtke-Gruener, Susann
Kopp, Maximilian
Heisterkamp, Alexander
Lubatschowski, Holger
Ripken, Tammo
author_sort Saerchen, Emanuel
collection PubMed
description 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.
format Online
Article
Text
id pubmed-6748420
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-67484202019-09-27 Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction Saerchen, Emanuel Liedtke-Gruener, Susann Kopp, Maximilian Heisterkamp, Alexander Lubatschowski, Holger Ripken, Tammo PLoS One Research Article 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. Public Library of Science 2019-09-17 /pmc/articles/PMC6748420/ /pubmed/31527880 http://dx.doi.org/10.1371/journal.pone.0222293 Text en © 2019 Saerchen et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Saerchen, Emanuel
Liedtke-Gruener, Susann
Kopp, Maximilian
Heisterkamp, Alexander
Lubatschowski, Holger
Ripken, Tammo
Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title_full Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title_fullStr Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title_full_unstemmed Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title_short Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
title_sort femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6748420/
https://www.ncbi.nlm.nih.gov/pubmed/31527880
http://dx.doi.org/10.1371/journal.pone.0222293
work_keys_str_mv AT saerchenemanuel femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction
AT liedtkegruenersusann femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction
AT koppmaximilian femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction
AT heisterkampalexander femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction
AT lubatschowskiholger femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction
AT ripkentammo femtosecondlaserinducedsteplikestructuresinsidetransparenthydrogelduetolaserinducedthresholdreduction