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Q: Fachverband Quantenoptik und Photonik

Q 62: Precision measurements and metrology IV

Q 62.4: Vortrag

Freitag, 21. März 2014, 15:00–15:15, DO24 1.101

Coating Thermal Noise Interferometer — •Tobias Westphal and the AEI 10m Prototype team — Albert Einstein Institut Hannover

Coating thermal noise (CTN) is becoming a more and more significant noise source as the sensitivity of interferometry is pushed to its limits. It arises from inherent mechanical loss of thin films in dielectric coatings. Deeper understanding and verification of its theory such as frequency dependence of losses requires direct (off-resonant) observation. The AEI 10 m Prototype facility is probably the best suited environment for this kind of experiment in a frequency range of special importance for earth bound gravitational wave detectors.

In this presentation the CTN- interferometer, being at the transition from construction to commissioning phase, will be presented. The range that is solely limited by CTN is designed to reach from 10 Hz to about 50 kHz, limited by seismic noise at low frequencies and shot noise (photon counting noise) at high frequencies. Therefore the interferometer is suspended in multiple stages. Digitally controlled actuation as well as active damping schemes were successfully demonstrated.