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Proceedings Paper

Experiments and characterization of two photon polymerization using 1 kHz femtosecond laser system
Author(s): Nitin Uppal; Panos S. Shiakolas
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Paper Abstract

Two Photon Polymerization (2PP) is a powerful technique for the fabrication of 2-D and 3-D microstructures by focusing ultrashort laser pulses inside a polymer resin mixture consisting of concentration of monomer and photo initiator. By scanning the focused laser beam in the bulk resin, a complex three dimensional pattern could be fabricated with micrometer resolution. This work presents the current state of our research towards fabricating microstructures using 2PP with a Ti:Sapphire femtosecond laser working at 800 nm wavelength and a pulse width of about 150 fs. The maximum pulse repetition rate of the laser system is 1 kHz, which is much smaller than the MHz systems normally used for the 2PP process. A mathematical model representing the polymerization process is presented. The governing partial differential equations for the process are solved numerically and the results are discussed. Characterization experiments are performed on commercially available acrylate monomer and photoinitiator to evaluate polymerization and damage threshold. In addition, the effects of self-focusing and self-trapping on the fabrication of microfeatures are presented.

Paper Details

Date Published: 6 February 2008
PDF: 8 pages
Proc. SPIE 6883, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics, 688311 (6 February 2008); doi: 10.1117/12.763715
Show Author Affiliations
Nitin Uppal, The Univ. of Texas at Arlington (United States)
Panos S. Shiakolas, The Univ. of Texas at Arlington (United States)

Published in SPIE Proceedings Vol. 6883:
Advanced Fabrication Technologies for Micro/Nano Optics and Photonics
Thomas J. Suleski; Winston V. Schoenfeld; Jian Jim Wang, Editor(s)

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