Browsing by Author "Ertek, C."

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    High-power Yb-based all-fiber laser delivering 300 fs pulses for high-speed ablation-cooled material removal
    (OSA - The Optical Society, 2018) Elahi, P.; Akçaalan, Ö.; Ertek, C.; Eken, K.; İlday, Fatih Ömer; Kalaycoglu, H.
    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.