Time-resolved study of back side ablated molybdenum thin films by ultrashort laser pulses
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Ultrashort laser pulses are used to ablate a thin molybdenum layer from glass by irradiating the metal film through the transparent substrate. The trajectories of ablated molybdenum fragments are recorded using a shadowgraphic setup with a time resolution in the nanosecond range. In addition, the shape of collected molybdenum fragments is examined as a function of applied fluence. It is confirmed that in a fluence regime close to the ablation threshold one single disc is ablated as a whole and its velocity is determined in the order of 50 ms−1. In a second fluence regime, partial melting at the center of the disc is found and small melt droplets are recorded on their flight. Mo fragments ablated in this regime feature a ring-like structure with a brittle fracture at the outer and a molten appearance at the inner edge.
KeywordsUltrashort Laser Pulse Soda Lime Glass Threshold Fluence ICCD Camera Soda Lime Glass Substrate
We acknowledge financial support by the German Federal Ministry of Education and Research (BMBF) under contract Nos. 13N11783 and 13N11788 (“Tailored for next PV, T4nPV”).
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