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Several methods have recently been proposed for improving the processing speed of the popular two-photon polymerization process. One such method makes use of a spatiotemporal focusing technique to achieve a planar projection printing strategy. This works uses a projection two-photon polymerization process in a continuous fashion to fabricate complex 3D structures at a large print rate while maintaining smooth surface features. Fabrication of millimeter scale structures are achievable with this continuous, layer-by-layer projection two-photon lithography system.
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Paul Somers, Jason E. Johnson, Zihao Liang, Bryan Boudouris, Liang Pan, Xianfan Xu, "High-speed 3D nanoprinting using continuous, layer-by-layer projection two-photon lithography," Proc. SPIE PC11992, Laser 3D Manufacturing IX, PC1199201 (1 April 2022); https://doi.org/10.1117/12.2609721