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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Photonics (3D Print) (joint session Q/K)

K 4.3: Vortrag

Montag, 10. März 2025, 17:30–17:45, HS V

Millimeter-sized 3D Printed Optics by Two-Photon Grayscale Lithography — •Leander Siegle and Harald Giessen — 4th Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We demonstrate millimeter-sized optics for focusing and imaging applications fabricated by two-photon grayscale lithography (2GL). Typical sizes of 2GL 3D printed lenses have previously been limited to the sub-millimeter range. Using low-magnification objectives in combination with high photo-initiator density resists, we fabricate aspherical lenses with diameters of 1 to 5 mm. Compared to the typical two-photon polymerization fabrication process, 2GL offers better shape accuracy, while simultaneously increasing throughput. To showcase 2GL fabricated millimeter-sized lenses, we design, 3D print, and optimize high-numerical aperture singlet lenses for focusing and imaging in the visible and near-infrared. We determine the shape accuracy and analyze the optical performance. Furthermore, we investigate a singlet lens for imaging and examine the high-resolution performance with a USAF 1951 resolution test chart. 2GL 3D printed lenses offer toolless rapid prototyping for custom optical solutions in the micron to millimeter range.

Keywords: 3D Printing; Grayscale Lithography; Microoptics; Additive Manufacturing; Two-photon polymerization