Light-shining-through-walls with lasers

Light-Shining-Through-Walls experiments are the search experiments for weakly interact- ing slim particles (WISPs) with the smallest model dependence. They have the advantage that not only the detection, but also the production of the WISPs takes place in the lab- oratory and can thus be controlled. Using lasers is the preferred option for most of the mass region and has led to the world's most stringent laboratory limits (ALPS I) there. At CERN, OSQAR promises to surpass these and at DESY ALPS II is currently set up, which is planning to probe the axion-like particle to photon coupling down to vertical stroke gaγ vertical stroke >or similar 2.10-11 GeV-1, which is in a region favored by many astrophysical hints.