Tuning the velocity and flux of a low-velocity intense source of cold atomic beam

Chen Shu¹, Li Ying-Ying¹, Yan Xue-Shu¹, Xue Hong-Bo², Feng Yan-Ying^{1, †}

(color online) (a) Raman–Ramsey fringes with a linewidth of 395 Hz (FWHM) for the central fringe and corresponding free evolution time of 1.3 m/s when the longitudinal mean velocity of the cold atomic beam is 15 m/s. (b) The Raman–Ramsey fringes with a linewidth of 500 Hz (FWHM) for the central fringe and corresponding free evolution time of 1.0 m/s when the longitudinal mean velocity of the cold atomic beam is 19 m/s.