Continuous Lyman-alpha generation by four-wave mixing in mercury for laser-cooling of antihydrogen

摘要

Cooling antihydrogen atoms is important for future experiments both to testthe fundamental CPT symmetry by high-resolution laser spectroscopy and also tomeasure the gravitational acceleration of antimatter. Laser-cooling ofantihydrogen can be done on the strong 1S-2P transition at the wavelength ofLyman-alpha (121.6nm). A continuous-wave laser at the Lyman-alpha wavelengthbased on solid-state fundamental lasers is described. By using a two-photon anda near one photon resonance a scan across the whole phasematching curve of thefour-wave mixing process is possible. Furthermore the influence of the beamprofile of one fundamental beam on the four-wave mixing process is studied.