A simple 2 W continuous-wave laser system for trapping ultracold metastable helium atoms at the 319.8 nm magic wavelength

R. J. Rengelink, R. P. M. J. W. Notermans, W. Vassen

High precision spectroscopy on the $2{}^{3}S\to 2{}^{1}S$ transition is possible in ultracold optically trapped helium but the accuracy is limited by the ac-Stark shift in…