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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.48: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Testing novel high-reflectivity mirror coatings from room temperature to 4 K — •Mona Kempkes, Jialiang Yu, Sofia Herbers, Thomas Legero, Uwe Sterr, and Daniele Nicolodi — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

Brownian thermal noise of highly reflective mirror coatings is the fundamental limit to the performance of many precision laser experiments. Very high reflectivity mirrors with significantly lower mechanical losses than traditional Ta₂O₅/SiO₂ multilayers are needed to improve the stability of optical resonators. Few promising alternatives have been developed so far. However, direct coating noise measurements in representative setups are required to validate their performance, as demonstrated by our experiments with Al_0.92Ga_0.08As/GaAs crystalline coatings [J. Yu et al., arXiv:2210.15671 (2022) and D. Kedar et al., arXiv:2210.14881 (2022)]. We will present our setup for the characterization of mirror coatings performance and direct Brownian thermal noise measurements from room-temperature to 4 K in a cryogenic optical resonator. This facility will be used to test novel mirror solutions as meta-mirrors and amorphous-Si based coatings.

We acknowledge support by the Project 20FUN08 NEXTLASERS, which has received funding from the EMPIR programme cofinanced by the Participating States and from the European Union’s Horizon 2020 Research and Innovation Programme and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC-2123 QuantumFrontiers, Project-ID 390837967.