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Q: Fachverband Quantenoptik und Photonik

Q 9: Photonics (3D Print) (joint session Q/K)

Q 9.4: Vortrag

Montag, 10. März 2025, 17:45–18:00, HS V

Near-infrared Laser damage in 3D printed microoptics — •Sebastian Klein, Pavel Ruchka, Tobias Steinle, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

In recent years, two-photon-polymerization (2PP) 3D printing has seen a significant rise in importance in the field of microoptics, delivering high precision free-form optics with a low manufacturing cost compared to conventional fused silica microoptics. Applications range from biomedical imaging systems such as endoscopes, to employment in compact high-power fiber-based laser systems and material processing using diffractive optical elements for customized beam shaping. For the latter, high reliability and performance even under high power densities are essential.

In this work, we quantify femtosecond laser-induced damage in the 2PP photoresists IP-S and OrmoComp by microscope imaging cube samples irradiated with different wavelengths and fluences. By incorporating the more sensitive differential interference contrast (DIC) imaging technique, we determine damage thresholds of these photopolymers in the NIR spectral range. Furthermore, we introduce a novel approach for damage detection surpassing the sensitivity of DIC microscopy. With this approach, the damaging effects of telecom C-band radiation after multiple hour exposures are studied, giving a first look at the long-time high-power stability of the polymers.

Keywords: microoptics; two photon polymerization; damage test; LIDT; 3D printing