Ablation Dynamics - from absorption to heat accumulation/ultra-fast laser matter interaction

Kramer, Thorsten; Remund, Stefan Marco; Jäggi, Beat; Schmid, Marc Jean-Christophe; Neuenschwander, Beat (2018). Ablation Dynamics - from absorption to heat accumulation/ultra-fast laser matter interaction Advanced Optical Technologies, 7(3), pp. 129-144. De Gruyter 10.1515/aot-2018-0010

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Ultra-short laser radiation is used in manifold industrial applications today. Although state-of-the-art laser sources are providing an average power of 10–100 W with repetition rates of up to several megahertz, most applications do not benefit from it. On the one hand, the processing speed is limited to some hundred millimeters per second by the dynamics of mechanical axes or galvanometric scanners. On the other hand, high repetition rates require consideration of new physical effects such as heat accumulation and shielding that might reduce the process efficiency. For ablation processes, process efficiency can be expressed by the specific removal rate, ablated volume per time, and average power. The analysis of the specific removal rate for different laser parameters, like average power, repetition rate or pulse duration, and process parameters, like scanning speed or material, can be used to find the best operation point for microprocessing applications. Analytical models and molecular dynamics simulations based on the so-called two-temperature model reveal the causes for the appearance of limiting physical effects. The findings of models and simulations can be used to take advantage and optimize processing strategies. Keywords: heat accumulation; laser ablation; microprocessing; shielding; ultra-fast laser

Item Type:

Journal Article (Original Article)

Division/Institute:

School of Engineering and Computer Science > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS
School of Engineering and Computer Science

Name:

Kramer, Thorsten;
Remund, Stefan Marco;
Jäggi, Beat;
Schmid, Marc Jean-Christophe and
Neuenschwander, Beat0000-0001-9715-8557

ISSN:

2192-8576

Publisher:

De Gruyter

Language:

English

Submitter:

Admin import user

Date Deposited:

13 Nov 2019 09:22

Last Modified:

04 Nov 2021 21:45

Publisher DOI:

10.1515/aot-2018-0010

URI:

https://arbor.bfh.ch/id/eprint/6679

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