Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers

Saara Ruotsalainen, Petri Laakso, Anthony Hoult, Henrikki Pantsar

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


Single mode fiber lasers offer a competitive solution for laser welding of polymers. In most laser applications the highly Gaussian nature of the fiber laser out put beam is known to be beneficial but in the case of polymer joining this may not always be true. The strength of the weld is largely defined by the effective joint width, increasing weld width by increasing the number of scans or increasing the laser power can in some cases lead to degradation of the polymer near the center line of the weld. To avoid these problems, beam shapers can be used which convert the characteristic spatial profile of the beam into a more rectangular top hat shape. To investigate these possible improvements to the polymer welding process, polycarbonate samples have been welded with fiber laser quasi-simultaneously by using Gaussian and top hat beam profiles. Beam shaping was performed using a refractive optic module to a Galilean design. Limiting values for input energies were established by varying the laser power and the number of scans. Advantages of beam shaping are discussed based on these results.
Original languageEnglish
Title of host publicationProceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007
Place of PublicationStuttgart
Publication statusPublished - 2007
MoE publication typeB3 Non-refereed article in conference proceedings
Event4th International WLT-Conference Lasers in Manufacturing, LIM 2007: Lasers in manufacturing 2007 - Munchen, Germany
Duration: 18 Jun 200722 Jun 2007


Conference4th International WLT-Conference Lasers in Manufacturing, LIM 2007
Abbreviated titleLIM 2007


  • fiber laser
  • polymer welding
  • beam shaping
  • refractive optics


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