A physicist discusses how to visualize a molecule changing shape.

a b s t r a c tThe ALPS Collaboration runs a ''light shining through a wall'' (LSW) experiment to search for photon oscillations into ''weakly interacting sub-eV particles'' (WISPs) inside of a superconducting HERA dipole magnet at the site of DESY. In this paper we report on the first successful integration of a large-scale optical resonant cavity to boost the available power for WISP production in this type of experiments. The key elements are a frequency tunable narrow line-width continuous wave laser acting as the primary light source and an electronic feed-back control loop to stabilize the power build-up. We describe and characterize our apparatus and demonstrate the data analysis procedures on the basis of a brief exemplary run.

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