Cs 5D(5/2)-6F 728nm Laser Spectroscopy with Single Pumping Laser

The sub-Doppler absorption laser spectroscopy at 728nm transition from the 5D(5/2) state to the 6F state of cesium with linewidth near 10MHz is first experimentally performed with indirect pumping from the ground state 6S(1/2) to the state 7P(3/2) by a 455.5nm diode laser. Using a 455.5nm diode laser as an indirect pump laser, several excited states will be populated due to spontaneous decay from the 7P state. We first implement the sub-Doppler absorption laser spectroscopy at 728nm from the 5D(5/2) state to the 6.. state when Cs atoms within thermal glass cell decay to the 5D(5/2) state. Due to velocity transfer effect, the hyperfine structure of 5D(5/2) shows a mixed and complicated pattern but very clear structure when the 455.5nm pumping laser is counter-propagating (or co-propagating) with the 728nm probing laser.National Natural Science Foundation of China [91436210]SCI(E)ARTICLE33