Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | e0222293 |
| Fachzeitschrift | PLOS ONE |
| Jahrgang | 14 |
| Ausgabenummer | 9 |
| Frühes Online-Datum | 1 Sept. 2019 |
| Publikationsstatus | Elektronisch veröffentlicht (E-Pub) - 1 Sept. 2019 |
Abstract
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.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Allgemeine Biochemie, Genetik und Molekularbiologie
- Agrar- und Biowissenschaften (insg.)
- Allgemeine Agrar- und Biowissenschaften
- Allgemein
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in: PLOS ONE, Jahrgang 14, Nr. 9, e0222293, 01.09.2019.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Femtosecond laser induced step-like structures inside transparent hydrogel due to laser induced threshold reduction
AU - Saerchen, Emanuel
AU - Liedtke-Gruener, Susann
AU - Kopp, Maximilian
AU - Heisterkamp, Alexander
AU - Lubatschowski, Holger
AU - Ripken, Tammo
N1 - Funding information: TR received support from the German Research Association DFG (RI2066/5-1). ROWIAK GmbH provided support in the form of salaries for authors [ES, SLG, HL], but did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section. The Authors would like to thank the Hannoversche Zentrum für optische Technologien (HOT) for the use of their measurement equipment and discussions.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072290562&partnerID=8YFLogxK
U2 - 10.1371/journal.pone.0222293
DO - 10.1371/journal.pone.0222293
M3 - Article
C2 - 31527880
AN - SCOPUS:85072290562
VL - 14
JO - PLOS ONE
JF - PLOS ONE
SN - 1932-6203
IS - 9
M1 - e0222293
ER -