2013/12/15 by Fan Gao, Gao, F., H. Liu +13
Physics and Astronomy · #Advanced Fiber Laser Technologies #Atomic Physics (physics.atom-ph) #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.1312.4117
openalex publication_date 2013/12/15 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
We measure the transverse velocity distribution in a thermal Sr atomic beam precisely by velocity-selective saturated fluorescence spectroscopy. The use of an ultrastable laser system and the narrow intercombination transition line of Sr atoms mean that the resolution of the measured velocity can reach 0.13 m/s, corresponding to 90μK in energy units. The experimental results are in very good agreement with the results of theoretical calculations. Based on the spectroscopic techniques used here, the absolute frequency of the intercombination transition of 88Sr is measured using an optical-frequency comb generator referenced to the SI second through an H maser, and is given as 434 829 121 318(10) kHz.