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UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer

  • We report on the laser ablation of cyclic olefin copolymer using an amplified ultrashort pulsed laser in the ultraviolet spectral range. In addition to a high ablation depth per laser-structured layer up to 74 μm at a fluence of 22 J cm−2, an excellent mean roughness 𝑅𝑎 of laser-patterned surfaces down to 0.5 μm is demonstrated. Furthermore, with increasing fluence, increasing ablation efficiencies up to 2.5 mm3 W−1 min−1 are determined. Regarding the quality of the ablation, we observed steep ablation flanks and low debris formation, though for fluences above 10.5 J cm−2 the formation of troughs was observed, being attributed to multiple reflections on the ablation flanks. For comparison, laser ablation was performed under identical conditions with an infrared laser wavelength. The results highlight that UV ablation exhibits significant advantages in terms of ablation efficiency, surface roughness and quality. Moreover, our results show that a larger UV focus spot accelerates the ablation process with comparable quality, paving the way for high-power UV ultrashort pulsed lasers towards an efficient and qualitative tool for the laser machining of cyclic olefin copolymer. The production of complex microfluidics further underlines the suitability of this type of laser.
Metadaten
Author:Kay BischoffORCiD, Dominik Mücke, Gian-Luca Roth, Cemal Esen, Ralf HellmannORCiD
DOI:https://doi.org/https://doi.org/10.3390/polym14142962
Parent Title (English):Polymers
Document Type:Article
Language:English
Year of Completion:2022
Release Date:2024/02/27
GND Keyword:Femtosekundenlaser
Volume:14
Issue:14
First Page:2962
Last Page:2962
Urheberrecht:0
Institutes:Fakultät Ingenieurwissenschaften / Labore / Angewandte Lasertechnik und Photonik (alp)
research focus :Materials / Innovative Material Processing
Reviewed:ja
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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