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

Abstract

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
Pages351-356
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

Conference

Conference4th International WLT-Conference Lasers in Manufacturing, LIM 2007
Abbreviated titleLIM 2007
CountryGermany
CityMunchen
Period18/06/0722/06/07

Fingerprint

laser welding
fiber lasers
polymers
shapers
laser applications
polycarbonates
profiles
welding
lasers
modules
optics
degradation
output

Keywords

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

Cite this

Ruotsalainen, S., Laakso, P., Hoult, A., & Pantsar, H. (2007). Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers. In Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007 (pp. 351-356). Stuttgart.
Ruotsalainen, Saara ; Laakso, Petri ; Hoult, Anthony ; Pantsar, Henrikki. / Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers. Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007. Stuttgart, 2007. pp. 351-356
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abstract = "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.",
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Ruotsalainen, S, Laakso, P, Hoult, A & Pantsar, H 2007, Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers. in Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007. Stuttgart, pp. 351-356, 4th International WLT-Conference Lasers in Manufacturing, LIM 2007, Munchen, Germany, 18/06/07.

Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers. / Ruotsalainen, Saara; Laakso, Petri; Hoult, Anthony; Pantsar, Henrikki.

Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007. Stuttgart, 2007. p. 351-356.

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

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T1 - Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers

AU - Ruotsalainen, Saara

AU - Laakso, Petri

AU - Hoult, Anthony

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N1 - Project code: 9558

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N2 - 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.

AB - 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.

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KW - beam shaping

KW - refractive optics

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BT - Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007

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Ruotsalainen S, Laakso P, Hoult A, Pantsar H. Advantages of beam shaping in quasi-simultaneous fiber laser welding of polymers. In Proceedings of the Fourth International WLT-Conference on Lasers in Manufacturing 2007. Stuttgart. 2007. p. 351-356