Abstract

Developing versatile joining techniques to weld transparentmaterials on a micrometer scale is of great importance in a growing numberof applications, especially for the fabrication and assembly of biomedicaldevices. In this paper, we report on fs-laser microwelding of two transparentlayers of polymethyl methacrylate (PMMA) based on nonlinear absorptionand localized heat accumulation at high repetition rates. A fiber CPA lasersystem was used delivering 650-fs pulses at 1030 nm with repetition rates inthe MHz regime. The laser-induced modifications produced by the focusedbeam into the bulk PMMA were firstly investigated, trying to find a suitableset of process parameters generating continuous and localized melting.Results have been evaluated based on existing heat accumulation models.Then, we have successfully laser welded two 1-mm-thick PMMA layers ina lap-joint configuration. Sealing of the sample was demonstrated throughstatic and dynamic leakage tests. This fs-laser micro-welding process doesnot need any pre-processing of the samples or any intermediate absorbinglayer. Furthermore, it offers several advantages compared to other joiningtechniques, because it prevents contamination and thermal distortion of thesamples, thus being extremely interesting for application in direct laserfabrication of microfluidic devices.

Autore Pugliese

• Ancona Antonio

Tutti gli autori

• A. Volpe; F. Di Niso; C. Gaudiuso; A. De Rosa ;R. Martínez Vázquez ; A. Ancona ; P.M. Lugarà ; R. Osellame

Titolo volume/Rivista

Optics express

Anno di pubblicazione

2015

ISSN

1094-4087

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

Non Disponibile

Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

Non Disponibile