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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" displa...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/14/2962 |
| _version_ | 1797416270406090752 |
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| author | Kay Bischoff Dominik Mücke Gian-Luca Roth Cemal Esen Ralf Hellmann |
| author_facet | Kay Bischoff Dominik Mücke Gian-Luca Roth Cemal Esen Ralf Hellmann |
| author_sort | Kay Bischoff |
| collection | DOAJ |
| description | 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m at a fluence of 22 J cm<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula>, an excellent mean roughness <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>a</mi></msub></semantics></math></inline-formula> of laser-patterned surfaces down to 0.5 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m is demonstrated. Furthermore, with increasing fluence, increasing ablation efficiencies up to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2.5</mn></mrow></semantics></math></inline-formula> mm<sup>3</sup> W<sup>−1</sup> min<sup>−1</sup> 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<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula> 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. |
| first_indexed | 2024-03-09T06:01:00Z |
| format | Article |
| id | doaj.art-2f5257c0e0a3427ea9ec07449990da5f |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T06:01:00Z |
| publishDate | 2022-07-01 |
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| record_format | Article |
| series | Polymers |
| spelling | doaj.art-2f5257c0e0a3427ea9ec07449990da5f2023-12-03T12:08:21ZengMDPI AGPolymers2073-43602022-07-011414296210.3390/polym14142962UV-Femtosecond-Laser Structuring of Cyclic Olefin CopolymerKay Bischoff0Dominik Mücke1Gian-Luca Roth2Cemal Esen3Ralf Hellmann4Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Würzburger Straße 45, 63743 Aschaffenburg, GermanyApplied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Würzburger Straße 45, 63743 Aschaffenburg, GermanyApplied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Würzburger Straße 45, 63743 Aschaffenburg, GermanyApplied Laser Technologies, Ruhr-University Bochum, Universitätsstraße 150, 44801 Bochum, GermanyApplied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, Würzburger Straße 45, 63743 Aschaffenburg, GermanyWe 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 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m at a fluence of 22 J cm<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula>, an excellent mean roughness <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>R</mi><mi>a</mi></msub></semantics></math></inline-formula> of laser-patterned surfaces down to 0.5 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m is demonstrated. Furthermore, with increasing fluence, increasing ablation efficiencies up to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2.5</mn></mrow></semantics></math></inline-formula> mm<sup>3</sup> W<sup>−1</sup> min<sup>−1</sup> 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<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></semantics></math></inline-formula> 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.https://www.mdpi.com/2073-4360/14/14/2962femtosecond pulse laserultraviolet lasercyclic olefin copolymerlaser ablationmicrofluidics |
| spellingShingle | Kay Bischoff Dominik Mücke Gian-Luca Roth Cemal Esen Ralf Hellmann UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer Polymers femtosecond pulse laser ultraviolet laser cyclic olefin copolymer laser ablation microfluidics |
| title | UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer |
| title_full | UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer |
| title_fullStr | UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer |
| title_full_unstemmed | UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer |
| title_short | UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer |
| title_sort | uv femtosecond laser structuring of cyclic olefin copolymer |
| topic | femtosecond pulse laser ultraviolet laser cyclic olefin copolymer laser ablation microfluidics |
| url | https://www.mdpi.com/2073-4360/14/14/2962 |
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