Ultrashort single-pulse laser ablation of stainless steel, aluminium, copper and its dependence on the pulse duration

In this work, we investigate single-pulse laser ablation of bulk stainless steel (AISI304), aluminium (Al) and copper (Cu) and its dependence on the pulse duration. We measured the reflectivity, ablation thresholds and volumes under the variation of pulse duration and fluence. The known drop of effi...

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Bibliographic Details
Published in:Optics express 2021-05, Vol.29 (10), p.14561-14581
Main Authors: Winter, Jan, Spellauge, Maximilian, Hermann, Jens, Eulenkamp, Constanze, Huber, Heinz P, Schmidt, Michael
Format: Article
Language:English
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Summary:In this work, we investigate single-pulse laser ablation of bulk stainless steel (AISI304), aluminium (Al) and copper (Cu) and its dependence on the pulse duration. We measured the reflectivity, ablation thresholds and volumes under the variation of pulse duration and fluence. The known drop of efficiency with increasing pulse duration is confirmed for single-pulse ablation in all three metals. We attribute the efficiency drop to a weakened photomechanically driven ablation process and a stronger contribution of photothermal phase explosion. The highest energetic efficiency and precision is achieved for pulse durations below the mechanical expansion time of 3-5 ps, where the stress confinement condition is fulfilled.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.421097