Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Poster: Precision spectroscopy of atoms and ions (with Q)

A 14.20: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

High-finesse silicon optical resonators at cryogenic temperatures — •Eugen Wiens, Qun-Feng Chen, Ingo Ernsting, Heiko Luckmann, Alexander Nevsky, and Stephan Schiller — Institut für Experimentalphysik Heinrich-Heine Universität Düsseldorf, Universitätsstr.1, 4ß225 Düsseldorf

Ultra-stable high-finesse optical resonators are widely used in precision experiments for frequency stabilization of the lasers. In our work we investigate a high-finesse silicon optical resonator down to 1.5 K. It is made of a mono-crystalline silicon cylindrical spacer (25 cm long). The silicon high-reflection mirrors are optically contacted to the spacer, forming a high-finesse (> 200 000) resonator at the wavelength of 1560 nm. The resonators are mounted inside a pulse tube cooler cryostat on a vibration-insensitive support. A fiber laser at 1560 nm is locked to the resonator using a Pound-Drever-Hall technique. The frequency stability of the resonator is measured using a femto-second frequency comb, stabilized to an active hydrogen maser and an ultra-stable laser at 1156 nm. Systematic effects such as tilt of the resonator, laser power fluctuations, temperature instability etc. have been evaluated.