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research-article

Multiphoton Polymerization using Femtosecond Bessel Beam for Layerless 3D Printing

[+] Author and Article Information
Xiaoming Yu

ASME Member, CREOL, The College of Optics and Photonics, University of Central Florida, P.O. Box 162700, Orlando, FL 32816
yux@creol.ucf.edu

Meng Zhang

ASME Member, Department of Industrial and Manufacturing Systems Engineering, Kansas State University, 2061 Rathbone Hall, 1701B Platt St., Manhattan, KS 66506
meng@ksu.edu

Shuting Lei

ASME Member, Department of Industrial and Manufacturing Systems Engineering, Kansas State University, 2061 Rathbone Hall, 1701B Platt St., Manhattan, KS 66506
lei@ksu.edu

1Corresponding author.

ASME doi:10.1115/1.4038453 History: Received June 14, 2017; Revised August 29, 2017

Abstract

Photopolymerization enables the printing of three-dimensional (3D) objects through successively solidifying liquid photopolymer on 2D planes. However, such layer-by-layer process significantly limits printing speed, because a large number of layers need to be processed in sequence. In this paper, we propose a novel 3D printing method based on multiphoton polymerization using femtosecond Bessel beam. This method eliminates the need for layer-by-layer processing, and therefore dramatically increases printing speed for structures with high aspect ratios, such as wires and tubes. By using unmodulated Bessel beam, a stationary laser exposure creates a wire with average diameter of 100 ┬Ám and length exceeding 10 mm, resulting in an aspect ratio > 100:1. Scanning this beam on the lateral plane fabricates a hollow tube within a few seconds, more than 10 times faster than using the layer-by-layer method. Next, we modulate the Bessel beam with a spatial light modulator (SLM) and generate multiple beam segments along the laser propagation direction. Experimentally observed beam pattern agrees with optics diffraction calculation. This 3D printing method can be further explored for fabricating complex structures, and has the potential to dramatically increase 3D printing speed while maintaining high resolution.

Copyright (c) 2017 by ASME
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