Laser powder bed fusion of glass: a comparative study between CO2 lasers and ultrashort laser pulses

Brian Seyfarth; Lisa Schade; Gabor Matthäus; Tobias Ullsperger; Nils Heidler; Enrico Hilpert; Stefan Nolte

doi:10.1117/12.2545863

2 March 2020 Laser powder bed fusion of glass: a comparative study between CO₂ lasers and ultrashort laser pulses

Brian Seyfarth, Lisa Schade, Gabor Matthäus, Tobias Ullsperger, Nils Heidler, Enrico Hilpert, Stefan Nolte

Author Affiliations +

Proceedings Volume 11271, Laser 3D Manufacturing VII; 112710T (2020) https://doi.org/10.1117/12.2545863
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

During the last decade, laser assisted additive manufacturing evolved to a serious alternative to traditional manufacturing methods. The greatest benefit lies in the realization of almost any desired geometry impossible to create with common molding or cutting processes. Due to the lack of linear absorption in the visible and near infrared, transparent dielectrics like glass are challenging materials for laser powder bed fusion (LPBF). Here, a comparative study on the additive manufacturing of pure fused silica glass parts is presented. For the fusion process, either a common CO2 laser system working at 10.6 μm or an ultrashort pulse (USP) fiber laser system at 1030 nm were applied. While the mid-infrared laser radiation from CO₂-lasers is absorbed linearly, ultrashort laser pulses benefit from their extremely high peak power leading to strong nonlinear absorption. In contrast to alternative approaches [1], there was no need for binding materials. For both systems, a comprehensive parameter study is presented, highlighting major differences like surface quality, resolution and processing time.

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Brian Seyfarth, Lisa Schade, Gabor Matthäus, Tobias Ullsperger, Nils Heidler, Enrico Hilpert, and Stefan Nolte "Laser powder bed fusion of glass: a comparative study between CO₂ lasers and ultrashort laser pulses", Proc. SPIE 11271, Laser 3D Manufacturing VII, 112710T (2 March 2020); https://doi.org/10.1117/12.2545863

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