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. 2018 Feb 1;43(3):535-538.
doi: 10.1364/OL.43.000535.

High-power Yb-based all-fiber laser delivering 300 fs pulses for high-speed ablation-cooled material removal

High-power Yb-based all-fiber laser delivering 300 fs pulses for high-speed ablation-cooled material removal

Parviz Elahi et al. Opt Lett. .

Abstract

We report on a 72 W Yb all-fiber ultrafast laser system with 1.6 GHz intra-burst and 200 kHz burst repetition rate developed to demonstrate ablation-cooled material removal at high speeds. Up to 24 W is applied on Cu and Si samples with pulses of ∼300 fs, and record-high ablation efficiencies are obtained, compared to published results to date, despite using only ∼100 nJ pulses. Ablation speeds approaching 1 mm3/s are reported with 24 W of average power, limited by available laser power and beam scanning speed. More significantly, these results experimentally confirm the theoretically expected linear scaling of the ablation-cooled regime to higher average powers without sacrificing efficiency, which implies that further scaling is possible with further increases in laser power and scanning speeds.

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