Design and characterization of 3D-printed freeform lenses for random illuminations

Assefa, Bisrat G.; Saastamoinen, Toni; Pekkarinen, Markku; Biskop, Joris; Kuittinen, Markku; Turunen, Jari; Saarinen, Jyrki

doi:10.1117/12.2288223

Cited by 5 publications

(1 citation statement)

References 16 publications

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“…Common AM methods capable of fabricating transparent polymer elements are as follows: multijet modeling (MJM), stereolithography (SLA), Printoptical technology by Luxexcel; and two-photon polymerization technique. [6][7][8][9][10][11][12][13] The MJM method makes use of support structure of wax and a print head jetting material layer by layer, postpolishing is needed to smooth the printed surface. SLA uses an ultraviolet (UV) light source to cure the photopolymer resins layer by layer, similarly, postpolishing is needed.…”

Section: Introductionmentioning

confidence: 99%

Thermal Effects in Single-Point Curing Process for Pulsed Infrared Laser-Assisted 3D Printing of Optics

Hong

Xiao

et al. 2020

3D Printing and Additive Manufacturing

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Additive manufacturing (AM) process is an ideal way to rapidly prototype freeform optics. We present a new precision additive freeform optics manufacturing (AFOM) method using pulsed infrared laser to thermally cure optical silicones. To achieve the tight optical surface requirements, the curing volume pixel (voxel) of the AM process should be precisely controlled. We have developed an opto-thermal-chemical-coupled multiphysics model to simulate the curing process and predict the shape and size of cured polymer. Single-point curing experiments were conducted using a Q-switched fiber laser with an average power of 10 W and a repetition rate at 30 kHz. Numerical simulation shows a good agreement with the experiments, showing a path for a theoretically guided design of a high-precision AFOM process.

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