16 February 2018 Advanced welding of transparent materials by ultrashort laser pulses
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The welding of transparent materials by ultrashort laser pulses has gained particular interest in recent years. While the short pulse duration enables to locally modify glasses within the bulk, high pulse repetition rates facilitate to accumulate heat from pulse to pulse leading to local melting. After resolidification strong covalent bonds are formed providing high stability of the joined partners without the need of additional material such as glue. In particular dissimilar glasses can be welded with breaking strengths in the range of the volume material while the weld seams are gas dense and long term stable.

However, industrial applications demand for enhanced throughput. Scaling the process speed requires advanced concepts for temporal and spatial tailoring the laser induced heat. By using short laser pulse trains, so-called bursts allows to reduce or redistribute the induced stress and hence increase the breaking strength of welded samples in the range of the volume material. Besides the laser parameters used, also the surface quality and eventual gaps denote a decisive issue for laser welding under industrial conditions. In this framework time-resolved pump-probe measurements are used to analyze the evolution of weld seams, in particular the melt transfer in between the samples facilitating process development. By extending the time-resolved pump-probe setup with polarization optics even allows for quantitatively investigating laser induced stress which serves to optimize the achievable breaking strength.
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F. Zimmermann, F. Zimmermann, M. Jenne, M. Jenne, D. Grossmann, D. Grossmann, A. Gruber, A. Gruber, M. Kumkar, M. Kumkar, } "Advanced welding of transparent materials by ultrashort laser pulses", Proc. SPIE 10519, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXIII, 1051906 (16 February 2018); doi: 10.1117/12.2291451; https://doi.org/10.1117/12.2291451

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