SKM 2023 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 8: Development of Computational Methods: Diverse Topics and Machine Learning

MM 8.2: Talk

Monday, March 27, 2023, 16:00–16:15, SCH A 251

How much laser power can two-photon 3D printed microoptics withstand? — •Sebastian Klein, Pavel Ruchka, Tobias Steinle, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

In recent years, the manufacturing of small 3D printed microoptics has seen a rise in importance. 3D printed lenses are used for applications where space is of big concern. Tailored free form optics are ideally suited to improve the performance for specific use cases. New applications also include printing these optics onto optical fibers, for example for endoscopes in the biomedical field or for focusing a laser beam inside a compact fiber laser. In the latter case, the sustainability of high intensities of the pump laser is important. This is directly dependent on the maximum power the material of the lens can withstand.

In this work, we obtain a first insight into laser damage thresholds of the 2PP photoresist IP-S in the near-IR spectral range. We determine damage thresholds with femtosecond laser pulses for wavelengths in the range of 1550-2000 nm. We conduct these experiments on cube samples printed from IP-S and evaluate the damage of the exposed samples visually under a microscope, employing also differential interference contrast. The observed damage is mostly of thermal nature. Knowledge of damage thresholds of 3D printed micro-optics further pushes the applications to these limits, enabling high-power applications at safe operating intensities.