High-throughput machining using a high-average power ultrashort pulse laser and high-speed polygon scanner

Joerg Schille; Lutz Schneider; Andrè Streek; Sascha Kloetzer; Udo Loeschner

doi:10.1117/1.OE.55.9.096109

22 September 2016 High-throughput machining using a high-average power ultrashort pulse laser and high-speed polygon scanner

Joerg Schille, Lutz Schneider, Andrè Streek, Sascha Kloetzer, Udo Loeschner

Author Affiliations +

Optical Engineering, Vol. 55, Issue 9, 096109 (September 2016). https://doi.org/10.1117/1.OE.55.9.096109

Abstract

High-throughput ultrashort pulse laser machining is investigated on various industrial grade metals (aluminum, copper, and stainless steel) and Al₂O₃ ceramic at unprecedented processing speeds. This is achieved by using a high-average power picosecond laser in conjunction with a unique, in-house developed polygon mirror-based biaxial scanning system. Therefore, different concepts of polygon scanners are engineered and tested to find the best architecture for high-speed and precision laser beam scanning. In order to identify the optimum conditions for efficient processing when using high-average laser powers, the depths of cavities made in the samples by varying the processing parameter settings are analyzed and, from the results obtained, the characteristic removal values are specified. For overlapping pulses of optimum fluence, the removal rate is as high as 27.8 mm³/min for aluminum, 21.4 mm³/min for copper, 15.3 mm³/min for stainless steel, and 129.1 mm³/min for Al₂O₃, when a laser beam of 187 W average laser powers irradiates. On stainless steel, it is demonstrated that the removal rate increases to 23.3 mm³/min when the laser beam is very fast moving. This is thanks to the low pulse overlap as achieved with 800 m/s beam deflection speed; thus, laser beam shielding can be avoided even when irradiating high-repetitive 20-MHz pulses.

Citation Download Citation

Joerg Schille, Lutz Schneider, Andrè Streek, Sascha Kloetzer, and Udo Loeschner "High-throughput machining using a high-average power ultrashort pulse laser and high-speed polygon scanner," Optical Engineering 55(9), 096109 (22 September 2016). https://doi.org/10.1117/1.OE.55.9.096109

Published: 22 September 2016

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