We are pleased to announce and invite you to one of our weekly online zoom events.
 

Basic Investigations on laser micromachining with sub 100 fs pulses and an industrial grade laser system

Industrial grade ultrashort pulsed USP laser systems offer pulse durations of about 300 fs and higher whereas shorter pulse durations could only be achieved with research systems, as e.g. Ti:Sapphire, lacking from stability and high repetition rates as demanded for industrial laser micro processing. Former experiments showed that on the one hand an improve of the energy specific volume (process efficiency) can be achieved with shorter pulses. On the other hand, an ablation regime with very smooth surfaces on soda-lime glass was observed with pulses shorter than about 500 fs. Thus, it is worth to investigate the sub 100 fs regime for industrial laser micromachining processes.

We will show results from basic investigations on metals, semiconductors, ceramics and glasses with an industrial grade Light Conversion Carbide laser system at a wavelength of 1030 nm in combination with MIKS1_S pulse compressor from n2 Photonics (offering sub 100 fs pulses) and a high end galvo scanner from Scanlab. The achieved pulse duration amounted 57 fs on the workpiece and the experiments were carried out at a fixes repetition rate of 800 kHz, a spot radius of 15 µm and with average powers up to 28 W. For all materials the energy specific volume and the machining quality were investigated. For metals and ceramics no significant influence was expected for pulse durations shorter than 300 fs which was confirmed by the experiments. For semiconductors the situation changes and shorter pulses can lead to higher efficiencies in case of silicon or larger process windows in case of Germanium. However, a huge influence onto the machining quality was observed for UVFS and Sapphire where edges without any chipping were observed even at the highest average power of 28 W whereas strong chipping already appears for a pulse duration of 270 fs. We believe that machining of glasses and crystals could be the field where most benefit of this new technology can be taken.


Speaker

Prof. Beat Neuenschwander, Bern University of Applied Sciences BUAS 
Beat Neuenschwander studied physics at the University of Bern and realized 1996 his PhD at the Institute of Applied Physics in the field of diode pumped solid state lasers. From 1997 to 2002 he joined the company Numerical Modelling and since 2000 he is also at the Bern University of Applied Sciences BUAS where he lectures physics and applied laser technology. There he built up the laboratory for laser micro machining and laser surface engineering and became full professor in 2005. His main research topic, where he published more than 55 papers, is laser micromachining with ultra-short pulses and its industrial application. He is founder member of the national thematic network NTN swissphotonics, which he headed from 2008 – 2011 as managing director. Actually, he is expert for the funding agency Innosuisse, head of the optics section of the Swiss Society for Optics and Microscopy SSOM and chair of the LASE symposium at Photonics West.

Moderator

Dr. Christian Bosshard, Managing Director Swissphotonics
Dr. Christian Bosshard received his degree in Physics (1986) and his doctorate (1991, Silver medal award) from ETH. From 2001-2021 he was working at CSEM, first as Section Head and then as Vice President and Head Photonics. Since 2013 he is Managing Director of Swissphotonics. Christian is a Fellow of Optica, Board Member of EPIC, and Member of the Board of the University of Basel.

Date
Tuesday, 4 June 2024

Time
12:00 - 12:45

Software
Zoom

Costs
free of charge

Registration only necessary once
This event series requires registration (see link above). We will send you the access information (Zoom-link and ID) by email after the registration. As the Zoom link remains the same every week, you do not need to register again for the following meetings.

Contact
Prof. Beat Neuenschwander
Bern University of Applied Sciences BUAS

Contact Swissphotonics
Dr. Christian Bosshard
Managing Director Swissphotonics
+41 79 405 1826

17 March 2024, Christian Bosshard