Progress on four-wave mixing in mercury for lyman-alpha cooling of hydrogen

Precision hydrogen spectroscopy is important for determining the proton size, fundamental constants, and testing matter-antimatter symmetry. Slowing or trapping hydrogen atoms and beams will provide significant reductions in observed linewidths and systematic uncertainties for hydrogen's narrowest transitions. We report on progress of a CW Lyman-alpha system using four-wave mixing in mercury and discuss ways it can be future utilized to laser cool hydrogen by aid of magnetic guides.