Millimeter-Scale Diffractive Optical Elements Fabricated by TwoPhoton Polymerization for Beam Shaping in Materials Processing.
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| Title: | Millimeter-Scale Diffractive Optical Elements Fabricated by TwoPhoton Polymerization for Beam Shaping in Materials Processing. |
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| Authors: | Behlau, Felix1 felix.behlau@ruhr-uni-bochum.de, Marx, Jan1, Zimmermann, Leonie1, Thüsing, Tobias1, Albini, Elia1, Esen, Cemal1, Ostendorf, Andreas1 |
| Source: | Journal of Laser Micro / Nanoengineering. Nov2025, Vol. 20 Issue 3, p227-232. 6p. |
| Subjects: | Diffractive optical elements, Polymerization, Manufacturing processes, Microfabrication, Holography, Three-dimensional modeling, Optical modulation |
| Abstract: | Beam shaping is a crucial aspect in the field of laser materials processing. Among the optical elements available for this purpose, Diffractive Optical Elements (DOEs) stand out due to their robustness and versatility. However, a flexible fabrication method is desirable to facilitate rapid testing of different beam shapes using various DOEs. Two-Photon Polymerization (2PP) is a promising fabrication technology for this purpose, as it allows the creation of arbitrarily shaped three-dimensional structures with a resolution down to 100 nm and excellent surface quality. In this work, a DOE was fabricated using 2PP, which modulates the light into a set of two ring beams. The phase input was calculated as a computer-generated hologram using the prism and lens algorithm, where the term for the axial focus shift was substituted by an axicon hologram. The DOE has a diameter of 3.5 mm and a maximum height of 6.4 µm. To fabricate this DOE, the phase input image was converted into a corresponding three-dimensional STL file depending on the gray level of each hologram pixel. After fabrication, beam shaping properties of the DOE were analyzed using a beam profiler to visualize the resulting two ring beams. Damage threshold experiments validated the robustness of the DOE for material processing [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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