Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.10: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Cryogenic sapphire cavities as ultrastable optical frequency references for improved laboratory test of Lorentz invariance — •Erich Günter Leo Pape, Achim Peters, and Evgeny Kovalchuk — HU Berlin AG QOM, Newtonstraße 15, 12489 Berlin

We present the latest updates on our cryogenic sapphire cavities as ultrastable frequency references, which will be used for an improved laboratory test of Lorentz invariance in electrodynamics by testing the isotropy of the speed of light at the 10^(-20) level. We integrated two cavities into out closed-cycle cryostat at 4K with free beam propagation and active beam point stability control and with fiber-coupled beam propagation using fiber phase noise compensation and detection within the cryostat to minimize effects of residual amplitude modulation as well as to improve SNR.