Cold ablation driven by localized forces in alkali halides

Masaki Hada, Dongfang Zhang, Kostyantyn Pichugin, Julian Hirscht, Michał A. Kochman, Stuart A. Hayes, Stephanie Manz, Regis Y.N. Gengler, Derek A. Wann, Toshio Seki, Gustavo Moriena, Carole A. Morrison, Jiro Matsuo, Germán Sciaini and R.J. Dwayne Miller ()
Additional contact information
Masaki Hada: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Dongfang Zhang: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Kostyantyn Pichugin: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Julian Hirscht: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Michał A. Kochman: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Stuart A. Hayes: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Stephanie Manz: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Regis Y.N. Gengler: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Derek A. Wann: School of Chemistry, University of Edinburgh
Toshio Seki: Quantum Science and Engineering Center, Kyoto University
Gustavo Moriena: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
Carole A. Morrison: School of Chemistry, University of Edinburgh
Jiro Matsuo: Quantum Science and Engineering Center, Kyoto University
Germán Sciaini: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging
R.J. Dwayne Miller: The Max Planck Institute for the Structure and Dynamics of Matter, and The Hamburg Centre for Ultrafast Imaging

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Laser ablation has been widely used for a variety of applications. Since the mechanisms for ablation are strongly dependent on the photoexcitation level, so called cold material processing has relied on the use of high-peak-power laser fluences for which nonthermal processes become dominant; often reaching the universal threshold for plasma formation of ~1 J cm−2 in most solids. Here we show single-shot time-resolved femtosecond electron diffraction, femtosecond optical reflectivity and ion detection experiments to study the evolution of the ablation process that follows femtosecond 400 nm laser excitation in crystalline sodium chloride, caesium iodide and potassium iodide. The phenomenon in this class of materials occurs well below the threshold for plasma formation and even below the melting point. The results reveal fast electronic and localized structural changes that lead to the ejection of particulates and the formation of micron-deep craters, reflecting the very nature of the strong repulsive forces at play.

Date: 2014
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DOI: 10.1038/ncomms4863

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