Holographic tomographic volumetric additive manufacturing
Several 3D light-based printing technologies have been developed that rely on the photopolymerization of liquid resins. A recent method, so-called Tomographic Volumetric Additive Manufacturing, allows the fabrication of microscale objects within tens of seconds without the need for support structures. This method works by projecting intensity patterns, computed via a reverse tomography algorithm, into a photocurable resin from different angles to produce a desired 3D shape when the resin reaches the polymerization threshold. Printing using incoherent light patterning has been previously demonstrated. In this work, we show that a light engine with holographic phase modulation unlocks new potential for volumetric printing. The light projection efficiency is improved by at least a factor 20 over amplitude coding with diffraction-limited resolution and its flexibility allows precise light control across the entire printing volume. We show that computer-generated holograms implemented with tiled holograms and point-spread-function shaping mitigates the speckle noise which enables the fabrication of millimetric 3D objects exhibiting negative features of 31 mu m in less than a minute with a 40 mW light source in acrylates and scattering materials, such as soft cell-laden hydrogels, with a concentration of 0.5 million cells per mL.
WOS:001420017600007
39934122
École Polytechnique Fédérale de Lausanne
University of Southern Denmark
École Polytechnique Fédérale de Lausanne
École Polytechnique Fédérale de Lausanne
École Polytechnique Fédérale de Lausanne
University of Southern Denmark
École Polytechnique Fédérale de Lausanne
2025-02-11
16
1
1551
REVIEWED
EPFL
| Funder | Funding(s) | Grant Number | Grant URL |
EC | Eurostars | 196971 | ||
Swiss National Science Foundation (SNSF) | NNF16OC0021948;VOLTA-E! | ||
Novo Nordisk Foundation | |||
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