摘要
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^5.5μK.We obtain 5.1×10^7 atoms with the number density around 1×10^12 cm^-3.Our result gains a lower temperature than that got in other experiments,in which the cold Cs atoms with the temperature of^10μK have been achieved by the optical molasses cooling.
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.
基金
Project 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 Project of Shanxi Province,China(Grant No.201701D221002)
the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province
the Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics.
