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Abstract
High-resolution, high-speed 3D printing by two-photon polymerization (2PP) with a Nd:YVO4 Q-switched microchip laser at its fundamental wavelength of 1064 nm is demonstrated. Polymerization scan speeds of up to 20 mm/s and feature sizes of 250 nm are achieved using a high repetition rate Q-switched microchip laser with a semiconductor saturable absorber mirror (SESAM) and photoresist with a new photo-initiator bearing 6-dialkylaminobenzufuran as electron donor and indene-1,3-dione moiety as electron acceptor. The obtained results demonstrate the high potential of Q-switched microchip lasers for applications in 2PP 3D printing.
Highlights
Laser additive manufacturing is a rapidly growing technology, with an increasing impact in modern industry [1]
High-resolution, high-speed 3D printing by two-photon polymerization (2PP) with a Nd:YVO4 Q-switched microchip laser at its fundamental wavelength of 1064 nm is demonstrated
The obtained results demonstrate the high potential of Q-switched microchip lasers for applications in 2PP 3D printing
Summary
Laser additive manufacturing is a rapidly growing technology, with an increasing impact in modern industry [1]. Spatial resolution down to 100 nm is achievable by applying the two-photon polymerization (2PP) technology [3,4,5] This technology is used for direct writing of complex three-dimensional objects without any geometrical limitations [6] as opposed to stereo-lithography, where 3D printing is done layer by layer [7]. In the efforts to simplify and industrialize the direct laser writing of 3D polymer structures by 2PP, approaches using CW solid-state laser [13] and UV laser diode [14] have been examined. Thanks to the application of highly doped, high gain media, microchip lasers can be extremely compact, maintenance-free, and sufficiently cheap for mass-production
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