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Time-resolved study of back side ablated molybdenum thin films by ultrashort laser pulses

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Abstract

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.

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Acknowledgements

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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Authors and Affiliations

  1. Robert Bosch GmbH, Postbox 300240, 70442, Stuttgart, Germany

    Dominik Bartl, Andreas Michalowski & Andreas Letsch

  2. Institut für Strahlwerkzeuge, University Stuttgart, Pfaffenwaldring 43, 70569, Stuttgart, Germany

    Margit Hafner

  3. Institute of Applied Physics, Friedrich-Schiller-University, Max-Wien-Platz 1, 07743, Jena, Germany

    Stefan Nolte & Andreas Tünnermann

Authors
  1. Dominik Bartl
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  2. Andreas Michalowski
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  3. Margit Hafner
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  4. Andreas Letsch
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  5. Stefan Nolte
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  6. Andreas Tünnermann
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Correspondence to Dominik Bartl.

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Bartl, D., Michalowski, A., Hafner, M. et al. Time-resolved study of back side ablated molybdenum thin films by ultrashort laser pulses. Appl. Phys. A 110, 227–233 (2013). https://doi.org/10.1007/s00339-012-7118-9

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  • DOI: https://doi.org/10.1007/s00339-012-7118-9

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