Effect of confined laser plasma plumes on the formation of LIPSS structures on stainless steel 316L

Anupam Ghosal, Olivier Allegre, Zhu Liu, Gordon Jones

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Laser-induced periodic surface structures (LIPSS) has been used for functionalisation of stainless steel surfaces. Hence, the control of the formation of the LIPSS structures is an essential aspect of laser surface texturing. In this work, picosecond pulsed laser irradiation (wavelength 355nm, pulse duration 10ps, frequency 404.7 kHz) was performed on stainless steel 316L under confined laser plasma plumes in atmospheric condition. The plasma plumes generated due to laser-metal interaction were confined by covering the metal surface with a transparent glass plate at varying distances (Δz = 0, 300, 450, 900 μm). The effect of the gap between metal and glass surface towards the formation of uniform LIPSS was studied experimentally. High spatial frequency LIPSS (HFSL) was produced by controlling the gap width. Low-spatial-frequency-LIPSS (LSFL) was observed at higher fluence along with scattered metal deposits on the surface. This work demonstrated the possibility of creating uniform HSFL using confined laser plasma plumes as the impacting medium.
Original languageEnglish
Title of host publicationhttps://wlt.de/lim2021-proceedings/surface-functionalization
Number of pages6
Publication statusPublished - Jun 2021

Keywords

  • Laser-induced periodic surface structure (LIPSS)
  • Nanostructure
  • Picosecond pulsed laser
  • Surface topography
  • laser plasma plume
  • high-spatial-frequency-LIPSS (HSFL)

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