Ultrafast stamping by combination of synchronized galvanometer scanning with DOE’s or SLM

Gafner, Markus; Remund, Stefan Marco; Chaja, Michalina; Mähne, Torsten; Neuenschwander, Beat (2020). Ultrafast stamping by combination of synchronized galvanometer scanning with DOE’s or SLM Procedia CIRP, 94, pp. 802-806. 10.1016/j.procir.2020.09.126

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The up-scaling of laser micromachining processes with ultrashort pulses is limited due to heat accumulation and shielding effects. Multi beam scanning represents one of the strategies to overcome this drawback. It is in general realized by combining a diffractive beam splitter with a galvanometer scanner. A full synchronization with the laser repetition rate offers new possibilities with minimum thermal impact. We will demonstrate this by means of a multipulse-drilling on the fly process with a regular 5x5 spot pattern having a spot to spot spacing of 160µm. At a repetition rate of 100 kHz and an average power of 16 W we were able to drill more than 2’300 holes/s in a 10µm thick steel foil. We have further extended this technology with a special light modulator for different periodic spot patterns and more complex intensity distributions.

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

Name:

Gafner, Markus;
Remund, Stefan Marco;
Chaja, Michalina;
Mähne, Torsten and
Neuenschwander, Beat0000-0001-9715-8557

Subjects:

Q Science > QC Physics

ISSN:

2212-8271

Language:

English

Submitter:

Beat Neuenschwander

Date Deposited:

23 Sep 2020 10:18

Last Modified:

04 Nov 2021 21:46

Publisher DOI:

10.1016/j.procir.2020.09.126

Uncontrolled Keywords:

Laser micromachining; multi beam scanning; spatial light modulator; ultra-short laser pulses; drilling on the fly

ARBOR DOI:

10.24451/arbor.12372

URI:

https://arbor.bfh.ch/id/eprint/12372

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