Control of ultrafast laser ablation efficiency by stress confinement due to strong electron localization in high-entropy alloys

Redka D, Winter J, Gadelmeier C, Djuranovic A, Glatzel U, Minár J, Huber HP (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Applied Surface Science Elsevier

Book Volume: 594

Article Number: 153427

DOI: 10.1016/j.apsusc.2022.153427

Abstract

In the context of current state of the art, understanding the laser ablation efficiency decrease for pulse durations exceeding the mechanical relaxation time of a few ps remains a pending research question. A heuristic approach may be used to reveal the role of effective penetration depth on ablation efficiency. Extending familiar contributions of this quantity by a term related to the mechanical surface expansion during pulse irradiation, the relation of ablation efficiency and pulse duration is deciphered. Thus, longer pulses are coupled into an expanded surface, revealing a direct link to the violation of stress confinement. To best demonstrate this hypothesis, a material with high electron–phonon coupling as well as low thermal conductivity, i.e., strong electron localization, is required. These properties are accomplished by high-entropy alloys, and the CrMnFeCoNi alloy serves as prime candidate. We report on single-pulse ablation efficiency experiments of the CrMnFeCoNi alloy which are support by our proposed model.

Authors with CRIS profile

Jan Winter Lehrstuhl für Photonische Technologien (LPT)

Involved external institutions

Universität Bayreuth DE Germany (DE) Hochschule für angewandte Wissenschaften München DE Germany (DE) University of West Bohemia (UWB) CZ Czech Republic (CZ)

How to cite

APA:

Redka, D., Winter, J., Gadelmeier, C., Djuranovic, A., Glatzel, U., Minár, J., & Huber, H.P. (2022). Control of ultrafast laser ablation efficiency by stress confinement due to strong electron localization in high-entropy alloys. Applied Surface Science, 594. https://doi.org/10.1016/j.apsusc.2022.153427

MLA:

Redka, David, et al. "Control of ultrafast laser ablation efficiency by stress confinement due to strong electron localization in high-entropy alloys." Applied Surface Science 594 (2022).

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