High-spatial-frequency periodic surface structures on steel substrate induced by subnanosecond laser pulses

Haruki Hikage, Nami Nosaka, Shigeki Matsuo

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Abstract

By irradiation with 0.5 ns laser pulses at a wavelength λ = 1.064 m, laser-induced periodic surface structures (LIPSS) were fabricated on a steel substrate. In addition to low-spatial-frequency LIPSS (LSFL), a high-spatial-frequency LIPSS (HSFL) of period Λ ∼ 0.4λ with two-dimensional expansion was formed, although it is generally recognized that HSFL are formed only by ultrafast laser pulses. The wavevector of the observed HSFL was perpendicular to the electric field of the irradiated laser pulse (each ridge/groove of the HSFL was parallel to the electric field). We discuss the relationship between the formation of HSFL and the pulse duration.

Original languageEnglish
Article number112701
JournalApplied Physics Express
Volume10
Issue number11
DOIs
Publication statusPublished - 2017 Nov 1

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ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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