Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system

A. Ancona; C. Jauregui; S. Döring; F. Röser; J. Limpert; S. Nolte; A. Tünnermann

doi:10.1117/12.813488

24 February 2009 Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system

A. Ancona, C. Jauregui, S. Döring, F. Röser, J. Limpert, S. Nolte, A. Tünnermann

Author Affiliations +

Proceedings Volume 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX; 720311 (2009) https://doi.org/10.1117/12.813488
Event: SPIE LASE: Lasers and Applications in Science and Engineering, 2009, San Jose, California, United States

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.

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A. Ancona, C. Jauregui, S. Döring, F. Röser, J. Limpert, S. Nolte, and A. Tünnermann "Ultrashort pulse laser drilling of metals using a high-repetition rate high average power fiber CPA system", Proc. SPIE 7203, Commercial and Biomedical Applications of Ultrafast Lasers IX, 720311 (24 February 2009); https://doi.org/10.1117/12.813488

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