München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 74: Andere Gebiete der Experimentellen Teilchenphysik 2
T 74.5: Vortrag
Dienstag, 10. März 2009, 17:50–18:05, A022
Resonant Light Power Buildup in ALPS, a "Light Shining Through a Wall"-Experiment — •Tobias Meier1, Karsten Danzmann1, Klaus Ehret3, Maik Frede2, Matthias Hildebrandt2, Samvel Ghazaryan3, Axel Knabbe3, Axel Lindner3, Jenny List3, Niels Meyer3, Dieter Notz3, Javier Redondo3, Andreas Ringwald3, Günter Wiedemann4, and Benno Willke1 — 1Max Planck Institut für Gravitationsphysik, Albert Einstein Institut und Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstraße 38, D-30167 Hannover — 2Laserzentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover — 3Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, D-22607 Hamburg — 4Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg
We report on the first successfull application of a new experimental technique to search for weakly interacting sub-eV particles (WISPs) coupling to photons. As part of the ALPS experiment located at DESY in Hamburg, this technique uses an optical resonator to enhance the power inside a HERA dipole magnet on the production side of a typical "light shining through a wall"-experiment. We use a frequency doubled continuous-wave laser emitting 0.6 W of power at 532 nm that is stabilized to a linear optical resonator with 8 m length. On resonance we achieve a circulating power of 34 W within the magnet. With this we obtained sensitivities corresponding to a coupling strength of g≈ 5· 10−7 GeV−1 for interactions of axion-like particles and photons. The experimental setup and possible improvements will be described and compared with common experimental designs with pulsed lasers.