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A New Approach to Seal Polymer Microfluidic Devices Using Ultrashort Laser Pulses

  • We report on the joining of two different transparent thermoplastic polymers using infrared femtosecond laser pulses. Solely being based on nonlinear absorption, the developed micro-welding process for cyclo-olefin copolymers and polycarbonate does not require any intermediate absorbing layers or any surface pre-processing of the welding partners. In addition, it circumvents any heat damages at the outer surfaces of the welding partners. Femtosecond laser welding of cyclo-olefin copolymers is improved by increasing the numerical aperture of the focusing setup resulting in a wider and more homogenous welding cross-section. Welding results are classified by shear strength and fracture modes are analyzed using scanning electron microscopy. Furthermore, we demonstrate, to the best of our knowledge, first results of ultrashort pulse laser welding of transparent polycarbonate, one of the most used transparent polymers. In view of an optimized and stable micro-welding process, we study the influence of laser power and focal position on welding results. The application of ultrashort pulse laser welding for Lab-on-chip fabrication technologies is demonstrated by sealing an ultrashort pulse laser ablated microfluidic device based on a transparent polymer substrate.

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Metadaten
Author:Gian-Luca Roth, Cemal Esen, Ralf HellmannORCiD
Parent Title (English):Journal of Laser Micro/Nanoengineering
Document Type:Article
Language:English
Year of Completion:2019
Release Date:2020/05/05
GND Keyword:Femtosekundenlaser; Laserschweißen
Volume:14
Issue:1
First Page:49
Last Page:53
Urheberrecht:1
research focus :Wissensmanagement und Strukturwandel / Business Transformation and Innovation Management
Licence (German):Keine Lizenz - es gilt das deutsche Urheberrecht
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