Chinese Optics Letters, 2018, 16 (6): 060202, Published Online: Jul. 2, 2018
Observation of the 1S0–3P0 optical clock transition in cold 199Hg atoms Download: 779次
Abstract
We report on the observation of the highly forbidden S 1 0 – P 3 0 optical clock transition in laser-cooled Hg 199 atoms. More than 95% depletion of cold Hg 199 atoms is detected in the magneto-optical trap. Using the free-of-field detection method, the AC Stark shift from the cooling laser is removed from the in-field spectroscopy. At low-power clock laser pumping, the linewidth of the clock spectroscopy is approximately 450 kHz (full width at half-maximum), which corresponds to a Doppler broadening at the atom temperature of 60 μK. We determine the S 1 0 – P 3 0 transition frequency to be 1,128,575,290.819(14) MHz by referencing with a hydrogen maser and measuring with a fiber optical frequency comb. Moreover, a weak Doppler-free signal is observed.
Xiaohu Fu, Su Fang, Ruchen Zhao, Ye Zhang, Junchao Huang, Jianfang Sun, Zhen Xu, Yuzhu Wang. Observation of the 1S0–3P0 optical clock transition in cold 199Hg atoms[J]. Chinese Optics Letters, 2018, 16(6): 060202.