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Proceedings Paper

Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system
Author(s): A. Ancona; C. Jauregui; S. Döring; F. Röser; J. Limpert; S. Nolte; A. Tünnermann
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Paper Abstract

We present an experimental study of the drilling of metal targets with ultrashort laser pulses with pulse durations from 800 fs to 19 ps at repetition rates up to 1 MHz, average powers up to 70 Watts, using an Ytterbium-doped fiber CPA system. Particle shielding and heat accumulation have been found to influence the drilling efficiency at high repetition rates. Particle shielding causes an increase in the number of pulses for breakthrough. It occurs at a few hundred kHz, depending on the pulse energy and duration. The heat accumulation effect is noticed at higher repetition rates. Although it overbalances the particle shielding thus making the drilling process faster, heat accumulation is responsible for the formation of a large amount of molten material that limits the hole quality. The variations of the pulse duration reveal that heat accumulation starts at higher repetition rates for shorter pulse lengths. This is in agreement with the observed higher ablation efficiency with shorter pulse duration. Thus, the shorter pulses might be advantageous if highest precision and processing speed is required.

Paper Details

Date Published: 24 February 2009
PDF: 9 pages
Proc. SPIE 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX, 720311 (24 February 2009); doi: 10.1117/12.813488
Show Author Affiliations
A. Ancona, Friedrich-Schiller-Univ. of Jena (Germany)
CNR-INFM Regional Lab. LIT (Italy)
C. Jauregui, Friedrich-Schiller-Univ. of Jena (Germany)
S. Döring, Friedrich-Schiller-Univ. of Jena (Germany)
F. Röser, Friedrich-Schiller-Univ. of Jena (Germany)
J. Limpert, Friedrich-Schiller-Univ. of Jena (Germany)
S. Nolte, Friedrich-Schiller-Univ. of Jena (Germany)
A. Tünnermann, Friedrich-Schiller-Univ. of Jena (Germany)
Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)

Published in SPIE Proceedings Vol. 7203:
Commercial and Biomedical Applications of Ultrafast Lasers IX
Joseph Neev; Stefan Nolte; Alexander Heisterkamp; Rick P. Trebino, Editor(s)

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