Eigenschaften von Photonen

Zinth, Ursula

doi:10.1515/physiko.35.93

Cited by 1 publication

(2 citation statements)

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“…This behavior has also been observed on other materials [ 42 ]. The intensity of the reflected beam can be calculated by Fresnel’s formulas [ 43 ]. This behavior occurs due to increased ablation caused by a generated heat front after the first pass.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Due to dispersion, COC has an increasing refractive index with decreasing wavelength [ 2 ]. According to Fresnel’s formulas, the reflected fraction is larger due to impingement on a material with larger refractive index [ 43 ]. In addition, we find larger and more reattachments of particles (debris) when ablation is performed by infrared laser radiation (cf.…”

Section: Results and Discussionmentioning

confidence: 99%

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UV-Femtosecond-Laser Structuring of Cyclic Olefin Copolymer

et al. 2022

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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.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%