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Optical Engineering

Temporal pulse shaping for smoothing of printed metal surfaces
Author(s): Yuval Berg; Michael Zenou; Omer Dolev; Zvi Kotler
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Paper Abstract

The surfaces of laser-induced forward transfer (LIFT) printed metal structures show typical roughness characteristic of the metal droplet size (3 to 10  μm). 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=0.8  μm to RRMS=0.2  μm and the relative percentage of the voids was reduced from 7.3% to 0.9%.

Paper Details

Date Published: 13 January 2015
PDF: 5 pages
Opt. Eng. 54(1) 011010 doi: 10.1117/1.OE.54.1.011010
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Yuval Berg, Orbotech Ltd. (Israel)
Michael Zenou, Orbotech Ltd. (Israel)
The Hebrew Univ. of Jerusalem (Israel)
Omer Dolev, Orbotech Ltd. (Israel)
Zvi Kotler, Orbotech Ltd. (Israel)

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