Welding with ultrashort laser pulses: recent developments at TRUMPF

F. Zimmermann; B. Fuehra; S. Hecker; M. Kaiser; D. Flamm; J. Kleiner; T. Hesse

doi:10.1117/12.2577105

5 March 2021 Welding with ultrashort laser pulses: recent developments at TRUMPF

F. Zimmermann, B. Fuehra, S. Hecker, M. Kaiser, D. Flamm, J. Kleiner, T. Hesse

Author Affiliations +

Proceedings Volume 11673, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVI; 116730K (2021) https://doi.org/10.1117/12.2577105
Event: SPIE LASE, 2021, Online Only

Abstract

We report on our recent developments in the field of ultrashort pulse welding of transparent and transparent to opaque materials. Based on recent trends in diverse branches such as biomedicine or consumer electronics we obtain a demand of reliable and sustainable joining technologies. This can be addressed by the adhesive free and localized laser joining technique using ultrashort laser pulses. Nonlinear absorption as well as heat accumulation within the focal region generate localized joints that are long term stable. On the other hand, the short focal tolerance and small gap size that can be bridged leads to high requirements for the surface quality of the weld partners hindering a cost-effective industrial usage. To overcome these limitations, spatial and temporal beam shaping of the ultrashort laser pulses is used. Based on temporal energy modulation together with the world´s first optics for ultrashort pulse welding (Top Weld optics) much better weld performance in terms of focal tolerance and gap bridging is achieved. The process allows for the bridging of gaps up to 10μm and a focal tolerance of up to 300μm which is several times higher compared with Gaussian focusing (4μm gap size, 80μm focal tolerance). This enables a highly reproduceable welding process even for larger sample dimensions e.g. in the field of architecture. Furthermore, to ensure welding in industrial environment with high throughput a simple process diagnostic based on monitoring the process illumination is presented.

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Citation Download Citation

F. Zimmermann, B. Fuehra, S. Hecker, M. Kaiser, D. Flamm, J. Kleiner, and T. Hesse "Welding with ultrashort laser pulses: recent developments at TRUMPF", Proc. SPIE 11673, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXVI, 116730K (5 March 2021); https://doi.org/10.1117/12.2577105

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