Berlin 2024 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 2: High-resolution Lithography and 3D Patterning

KFM 2.3: Talk

Monday, March 18, 2024, 10:10–10:30, TC 010

3D beam-shaping by 3D printed holographic triplet on a fiber — •Zihao Zhang, Leander Siegle, Pavel Ruchka, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

Non-Gaussian beams are crucial for many research areas such as imaging and material processing. To create arbitrary beams, beam-shaping with diffractive and holographic optical elements can be used. For example, beam-shaping for glass cutting provides a number of focus copies at tailored positions in a three-dimensional working space, resulting in precisely controlled energy deposition within a volume of transparent materials. Often these beam-shaping optics are quite complicated and bulky. However, in some specific scenarios there is a demand not only for the miniaturization and simplicity, but also for the ability to adapt and change the focal distribution rather rapidly. Here, we present a beam-shaper triplet, 3D printed on a single-mode fiber using the maskless rapid additive manufacturing technique of two-photon polymerization (2PP). The triplet comprises a collimating diffractive lens, a tailored phase mask, and a focusing lens. As a result, we demonstrate several 3-dimensionally distributed arrays of focal spots produced by such a triplet with tailored phase masks. The triplet which is 3D-printed on a single fiber can easily be adjusted for the desired foci distribution. Our technique can play a crucial role in the miniaturization of beam-shaping setups for laser cutting, imaging, and optical trapping.

Keywords: 3D-printing; Holographic optics; Beam-shaping; Two-Photon Lithography