Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 17: Precision spectroscopy of atoms and ions I

A 17.5: Talk

Tuesday, March 13, 2012, 15:15–15:30, V55.01

Multipass laser cavity for efficient transverse illumination of an elongated volume — •Jan Vogelsang and the CREMA collaboration — Max-Planck-Institute for Quantum Optics, Garching

The recent measurement of the Lamb shift (2S-2P energy difference) in muonic hydrogen has attracted a lot of interest. The laser spectroscopy measurement has utilized a novel multipass cavity design which we will present.

The muon beam is stopped in a 200mm long and 5mm high stop volume inside hydrogen gas. Since the muon beam can not pass any mirrors we had to illuminate the long stop volume from the transverse direction. The cavity is very robust against mechanical misalignment, so no active mirror stabilization is required. A similar cavity will be used in the upcoming laser spectroscopy experiment in muonic helium ions.