Surface Morphologies in Ultra-short Pulsed Laser Processing of Stainless-Steel at High Repetition Rate

  • G. Lazzini
  • L. Gemini
  • A. H. A. Lutey
  • R. Kling
  • L. Romoli
  • M. Allegrini
  • F. FusoEmail author
Regular Paper


Stainless-steel is ablated with femtosecond laser pulses at high repetition rate. A multi-pass, high spatial overlap laser scanning strategy is applied in order to cope with the requirements for large-scale machining of high aspect ratio structures. Topography of the processed surfaces is analyzed via Shear Force Microscopy scans, with the main aim to investigate morphology changes as a function of process parameters. Quantitative assessment of local height variations enables a detailed investigation of the produced features. Depending on the process parameters, in particular on laser fluence and repetition rate, a transition from small islands to large bumps is observed, explained in terms of feature coalescence.


Nanostructured surfaces Laser machining Shear force microscopy Directed energy surface treatments 

List of symbols


Longitudinal direction of laser scan


Lateral direction of laser scan


Laser repetition rate


Laser scan speed


Laser fluence


Root-mean-square roughness


Surface peak density according to ISO 12178


Average motif area according to ISO 12178


Motif mean slope according to ISO 12178



This work has received funding from the EU Horizon 2020 Research and Innovation Programme under Grant Agreement No. 687613 “TresClean”. GL, MA and FF gratefully acknowledge technical assistance with the ShFM setup from Nicola Puccini and Enrico Andreoni.


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Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  1. 1.Department of Engineering and ArchitectureUniversity of ParmaParmaItaly
  2. 2.ALPhANOVInstitut d’Optique d’AquitaineTalenceFrance
  3. 3.Dipartimento di Fisica Enrico FermiUniversità di PisaPisaItaly
  4. 4.Istituto Nazionale di Ottica, INO-CNRPisaItaly

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