National Institutes of Natural Science, National Institute for Fusion Science
Department of Helical Plasma Research, Fundamental Physics Simulation Research Division


The 40th Best Paer Award of the Laser Society of Japan

Professor Hitoshi Sakagami won the 40th Best Paper Award of the Laser Society of Japan.
  • Date: May 31, 2016
  • Title:"Periodic Surface Structures Self-organized on Solid Materials Ablated by Femtosecond Laser Pulses"   

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  • Context:
    On solid material under irradiation of linearly polarized femtosecond laser pulses, the periodic surface structures are self-organized and oriented perpendicular or parallel to the laser polarization direction. For laser fluence levels near the ablation threshold, periodic structures have an interspace shorter than the laser wavelength. The interspaces of the periodic structures depend on laser fluence and laser wavelength, and these phenomena have been explained by such models as the parametric decay model, the bidirecrtional surface plasma wave model, the plasmon polariton excitation model, and the second harmonic generation model. However, since the mechanism of the periodic structures remains unclear, further investigation is required. In this paper, we summarize the current study of the periodic surface structure induced by femtosecond laser pulses and review the several models proposed for the formation mechanism.
The Review of Laser Engineering, Vol.43, No.11, pp.745-751.