Measurement of the maximum specific removal rate : unexpected influence of the experimental method and the spot size

Lauer, Benjamin; Jäggi, Beat; Zhang, Yiming; Neuenschwander, Beat (October 2015). Measurement of the maximum specific removal rate : unexpected influence of the experimental method and the spot size In: The 34th International Congress on Applications of Lasers & Electro-Optics (ICALEO) (pp. 146-154). Laser Institute of America 10.2351/1.5063162

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Ultra short laser pulses often are the tool of choice when high requirements concerning machining quality are demanded. But for industrial use the process has also to be efficient, meaning that the removal rate (ablated volume per time and average power) should be as high as possible. Many publications deal with the threshold fluence and the removal rate for various materials but often use different methods and beam parameters to determine these values. To demonstrate the influence of the different methods, the removal rate for steel and copper was determined for different pulse durations and different spot sizes using the following three different methods: With the first method the removal rate is calculated from the threshold fluence and the energy penetration depth deduced by machining craters at low repetition rates, measuring its depths and using the logarithmic ablation law. With the second method the removal rates were directly determined by measuring the volume of these craters and with the third method they were determined by measuring the volume of squares machined with a pulse overlap and higher repetition rates. This systematic study shows differences between the investigated methods themselves. Additionally it reveals for all three methods an unexpected influence of the spot size which is much more pronounced in the case of steel.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

Engineering and Information Technology > Institute for Surface Applied Laser, Phototonics and Surface Technologies ALPS
Engineering and Information Technology

Name:

Lauer, Benjamin;
Jäggi, Beat;
Zhang, Yiming and
Neuenschwander, Beat

ISBN:

978-1-940168-05-0

Publisher:

Laser Institute of America

Language:

English

Submitter:

Admin import user

Date Deposited:

16 Mar 2020 13:43

Last Modified:

16 Mar 2020 13:43

Publisher DOI:

10.2351/1.5063162

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.7607

URI:

https://arbor.bfh.ch/id/eprint/7607

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