Laser surface structuring with 100W of average power and sub-ps pulses

Neuenschwander, Beat; Jaeggi, Beat; Zimmermann, Markus; Markovic, Vesna; Resan, Bojan; Weingarten, Kurt; de Loor, Ronny; Penning, Lars (2016). Laser surface structuring with 100W of average power and sub-ps pulses Journal of Laser Applications, 28(2), 022506. Laser Institute of America (LIA) 10.2351/1.4944104

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High throughput still represents a key factor for industrial use of ultrashort pulses in the field of surface structuring. Reliable systems with average powers up to 100W are today available. It has already been proved that metals, especially steel having a low threshold fluence, can be machined with excellent surface quality at average powers of more than 40W and a spot radius of about 25lm, if a polygon line scanner, offering fast scanning speeds, is used. A further scale-up into the 100W regime should be possible for metals showing a threshold fluence of about 0.2 J/cm2 or higher. But, it will lead to problems with heat accumulation in the case of steel and a straight forward scale-up is not possible. In order to keep a good surface quality, the machining strategy has to be adapted. A maximum flexibility can be obtained with an “interlaced” mode by using very high marking speeds of several 100m/s and repetition rates of several tenths of MHz. As this is at the edge of today available technologies, alternative strategies are additionally investigated. Enlarging the spot size represents the most simple approach to reduce the heat accumulation in the case of steel but also multispots represent an attractive alternative.

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:

Neuenschwander, Beat0000-0001-9715-8557;
Jaeggi, Beat;
Zimmermann, Markus;
Markovic, Vesna;
Resan, Bojan;
Weingarten, Kurt;
de Loor, Ronny and
Penning, Lars

ISSN:

1938-1387

Publisher:

Laser Institute of America (LIA)

Language:

English

Submitter:

Admin import user

Date Deposited:

25 Feb 2020 14:52

Last Modified:

04 Nov 2021 21:45

Publisher DOI:

10.2351/1.4944104

Additional Information:

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing

ARBOR DOI:

10.24451/arbor.7608

URI:

https://arbor.bfh.ch/id/eprint/7608

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