Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.54: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Frequency stabilization and automatic alignment for the resonantly-enhanced Light-shining-through-a-wall experiment ALPS-II — •Robin Bähre1 and The ALPS Collaboration2 — 1Max-Planck-Institute for Gravitational Physics, Hannover — 2DESY, Hamburg
Searches for weakly interacting sub-eV particles (WISPs) with Light-shining-through-a-wall (LSW) experiments can be largely improved by resonant production and signal enhancement. However, efficient application of these techniques places demanding requirements on frequency matching and spatial alignment of the optical and axion modes. The LSW experiment ALPS-II implements a dichroic sensor scheme for mode frequency and pointing fluctuations. The sensor signals are used for automatic alignment and Pound-Drever-Hall stabilization of the resonator modes and thus enable the mutual alignment of the optical modes to ensure efficient overlap between both Eigenmodes. The poster will provide an optical setup, requirements on frequency and spatial stability of the cavity modes and how these can be achieved with control loops. We present results of our table-top prototype setup and show which steps are made towards a first optical WISP search with resonantly-enhanced regeneration and towards our final experiment stage with two 100 m cavities with a power build up of 5000 and 40000.