Enhanced optical molasses cooling for Cs atoms with largely detuned cooling lasersProject supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the National Natural Science Foundation of China (Grant Nos. 61722507, 61675121, and 61705123), PCSIRT (Grant No. IRT17R70), the 111 Project (Grant No. D18001), the Shanxi 1331 KSC, the Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi (OIT), the Applied Basic Research Pro

• Published in: Chinese physics B Vol. 29; no. 2
• Main Authors: Zhang, Di, Li, Yu-Qing, Wang, Yun-Fei, Fu, Yong-Ming, Li, Peng, Liu, Wen-Liang, Wu, Ji-Zhou, Ma, Jie, Xiao, Lian-Tuan, Jia, Suo-Tang
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.02.2020
• Subjects: frequency detuning; laser cooling; magneto-optical trap; optical molasses
• ISSN: 1674-1056
• DOI: 10.1088/1674-1056/ab5fc6

We report a detailed study of the enhanced optical molasses cooling of Cs atoms, whose large hyperfine structure allows to use the largely red-detuned cooling lasers. We find that the combination of a large frequency detuning of about −110 MHz for the cooling laser and a suitable control for the powers of the cooling and repumping lasers allows to reach a cold temperature of ∼ 5.5 μK. We obtain 5.1× 107 atoms with the number density around 1× 1012 cm−3. Our result gains a lower temperature than that got in other experiments, in which the cold Cs atoms with the temperature of ∼ 10 μK have been achieved by the optical molasses cooling.