Simultaneous sub second laser welding of polymers with diffractive optics

Petri Laakso, Saara Ruotsalainen, Tuomas Purtonen, Hannu Minkkinen, Veli Kujanpää, Antti Salminen

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

    4 Citations (Scopus)


    The paper presents a novel method for simultaneous transmission welding of polymers using a high power multimode fiber laser. The method utilizes a diffractive optical element which shapes the focused laser beam into the desired weld shape. This kind of optical device enables the use of high power multimode fiber laser which again gives a possibility to use sub-second welding times.
    Weld quality was assessed in terms of strength (pull test) and visual appearance. The diffractive optics provides an even powerd istribution and only small part of power is lost on the zeroth order.
    Design of diffractive element gives flexibility with the weld shapes and sizes but the drawback is that these parameters cannot be modified after the production of the element. Using the optics would be more advantageous if multiple parts could be welded at one shot because the part changing time will be a lot longer than the welding time. Results show good weld quality, superior welding speed and high weld strength compared to quasi-simultaneous laser welding of the same material.
    Original languageEnglish
    Title of host publicationICALEO 2010: 29th International Congress on Applications of Lasers and Electro-Optics
    Subtitle of host publicationAnaheim, CA, USA, 26-30 Sept. 2010
    Place of PublicationOrlando, FL, USA
    PublisherLaser Institute of America
    ISBN (Print)978-0-912035-61-1
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication


    • Simultaneous welding
    • Fiber laser
    • diffractive optic


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