Special Section on Fiber Lasers and Applications

Temporal pulse shaping for smoothing of printed metal surfaces

[+] Author Affiliations
Yuval Berg

Orbotech Ltd., Additive Manufacturing Group, Yavne 8110101, Israel

Michael Zenou

Orbotech Ltd., Additive Manufacturing Group, Yavne 8110101, Israel

The Hebrew University of Jerusalem, Racah Institute of Physics and the Harvey M. Kruger Family Center for Nanoscience and Nanotechnology, Jerusalem 9190401, Israel

Omer Dolev

Orbotech Ltd., Additive Manufacturing Group, Yavne 8110101, Israel

Zvi Kotler

Orbotech Ltd., Additive Manufacturing Group, Yavne 8110101, Israel

Opt. Eng. 54(1), 011010 (Jan 13, 2015). doi:10.1117/1.OE.54.1.011010
History: Received July 17, 2014; Accepted December 17, 2014
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Abstract.  The surfaces of laser-induced forward transfer (LIFT) printed metal structures show typical roughness characteristic of the metal droplet size (3 to 10μm). Submicron voids are often observed in the bulk of such printed metal structures with consequences on the mechanical strength, chemical resistivity, and electrical conductivity. We present the results of our efforts to reduce surface roughness and bulk voids by controlled laser melting. We have used temporally shaped pulses from a fiber laser tunable in the range from 1 to 600 ns in order to improve the quality of LIFT printed copper and aluminum structures. For the best case shown, roughness was improved from RRMS=0.8μm to RRMS=0.2μm and the relative percentage of the voids was reduced from 7.3% to 0.9%.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Yuval Berg ; Michael Zenou ; Omer Dolev and Zvi Kotler
"Temporal pulse shaping for smoothing of printed metal surfaces", Opt. Eng. 54(1), 011010 (Jan 13, 2015). ; http://dx.doi.org/10.1117/1.OE.54.1.011010


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