Holographic Volumetric Additive Manufacturing
arxiv(2024)
摘要
3D printing has revolutionized the manufacturing of volumetric components and
structures in many areas. Different technologies have been developed including
light-induced techniques based on the photopolymerization of liquid resins. In
particular, a recently introduced method, so-called Tomographic Volumetric AM
(VAM), allows the fabrication of mesoscale objects within tens of seconds
without the need for support structures. This method works by projecting
thousands of amplitude patterns, computed via a reverse tomography algorithm,
into a resin from different angles to produce the desired three-dimensional
shape when the resin reaches the polymerization threshold. To date, only
amplitude modulation of the patterns has been reported. Here, we show that
holographic phase modulation unlocks new capabilities for VAM printing.
Specifically, the effective light projection efficiency is improved by at least
a factor of 10 over amplitude coding; the resolution can reach the light
diffraction limit; and phase encoding allows to control ballistic photons in
scattering media, which potentially increases the volume of 3D objects that can
be printed in opaque and non-absorbing resins. The approach uses CGH to convert
phase, encoded on a 2D modulator to the desired intensity projections by light
propagation in a photosensitive resin container. We demonstrate the potential
of holographic phase coding using simulations and experiments, the latter by
implementing a volumetric printer using a DMD, as the 2D phase modulator in a
Fourier configuration. Specifically, we use Lee holograms to encode phase onto
a binary DMD. Combining tiled holograms with PSF shaping mitigates the speckle
noise typically associated with computer-generated holograms and speed-up their
computation. We use these holographic projections to fabricate millimetric 3D
objects in less than a minute with a resolution down to 164 um.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要