SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Photonics IV
Q 60.4: Talk
Friday, March 10, 2023, 11:45–12:00, A320
Noise characterization of crystalline AlGaAs coatings for ultra-stable optical resonators — •Chun Yu Ma1, Jialiang Yu1, Sofia Herbers1, Thomas Legero1, Daniele Nicolodi1, Fritz Riehle1, Steffen Sauer2, Dhruv Kedar3, John M. Robinson3, Eric Oelker4, Jun Ye3, and Uwe Sterr1 — 1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany — 2Institut für Halbleitertechnik and LENA, Technische Universität Braunschweig, Germany — 3JILA, NIST and University of Colorado, Boulder, Colorado, USA — 4University of Glasgow, UK
Brownian thermal noise of highly reflective dielectric coatings fundamentally limits the frequency stability of state-of-the-art ultra-stable lasers. Crystalline AlGaAs mirror coating with low mechanical loss is a promising candidate to reduce this limit. However, our recent measurements at cryogenic temperatures have shown novel noise sources in AlGaAs mirrors beyond their thermal noise level [J. Yu et al., arXiv:2210.15671 (2022) and D. Kedar et al., arXiv:2210.14881 (2022)].
In this work, we present a new investigation on the novel noise sources in AlGaAs mirrors in a room temperature ultra-stable resonator and give an update on our measurement at cryogenic temperatures. Our work provides insight into the predicted and actual noise limits set by these 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.