Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Photonics (3D Print) (joint session Q/K)
Q 9.8: Vortrag
Montag, 10. März 2025, 18:45–19:00, HS V
Fiber-based femtosecond 3D printing — •Anton Hellstern1, Claudia Imiolczyk1, Pavel Ruchka1, Marco Wende2, Theresa Kühn3, Moritz Flöß1, Michael Heymann3, Andrea Toulouse2, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart, Germany — 2Institute of Applied Optics, University of Stuttgart, Germany — 3Institute of Biomaterials and Biomolecular Systems, University of Stuttgart, Germany
Ultrashort laser pulses are often used in medical applications, for instance for soft-tissue surgeries. However, the progress on using such laser pulses for additive manufacturing of tissue is rather marginal so far. Therefore, we aim to realize an endoscopic fiber-based femtosecond 3D printer to minimally invasively surgically repair organ damage on a micrometer scale. For this, high peakpower femtosecond laser pulses are required, in order to 3D print the desired geometries using two-photon-lithography. By combining a grating compressor, a single-mode fiber, and suitable 3D printed microobjetives directly on the fiber tip, we achieve subpicosecond pulse durations which are able to polymerize both commercial photopolymers as well as bioinks. We report on dose tests, the optimization of printing speed, laser power, pulse compression ratio and pulse duration, as well as slicing and hatching variation. We demonstrate solid cubes as well as connected lines, leading to 3D woodpile structures that represent scaffolds which ultimatively could be colonized by living cells. This direct printing of cell scaffolds by endoscopic 3D printing should allow in the future for example printing of bone tissue inside the body.
Keywords: 3D printing; Pulse compression; Dispersion compensation; Bio application; Additive manufacturing