Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster Präzisionsmessungen und Metrologie
Q 30.6: Poster
Tuesday, March 11, 2008, 16:30–19:00, Poster C2
Testing the Isotropy of the Speed of Light using ULE Optical Resonators — •Christian Eisele1, Maxim Okhapkin2, Alexander Yu. Nevsky1, and Stephan Schiller1 — 1Institut für Experimentalphysik, Heinrich-Heine-Universität, 40225 Düsseldorf — 2Institute for Laser Physics, Novosibirsk, Russia
Modern Michelson-Morley-type experiments with ultra-stable resonators are aiming to measure a possible violation of Lorentz invariance for electromagnetic waves.
We will report about the latest results of our measurements using optical high finesse resonators (F = 190000) orthogonally embedded in a rectangular ULE (ultra low expansion coefficient glass) block. This design gives a certain amount of common mode rejection for several disturbances. A monolithic Nd:YAG laser at 1064 nm is frequency stabilized to the resonance frequencies of the resonators, and the difference frequency between the resonators is measured as a function of the orientation of the cavities in space. To improve the short term frequency stability of the laser system, we use an active vibration isolation system. For active rotation of the setup a highly-accurate air-bearing rotation table is used.