The Analysis,Execution And Control Of Magnetic For Sr Optical Clock

Atom optical clock is a new quantum frequency standard based on laser cooling atomic, with the uncertainty of 10-18, which is considered as a new International time and frequency reference. In the process of developing optical clock, atomic samples with lower temperature and larger quantity are needed. In the experiment, the atomic sample is obtained by two-stage laser cooling .The first-stage cooling uses dipole transition (5s²)¹S₀→(5s5p)¹ P₁, with the according radiation wavelength 461nm. The second-stage uses the level transition (5s₂)₁S₀→(5s5p)³P₁, with the according radiation wavelength 689nm. At present, we have accomplished the first cooling experiment, that's Blue MOT. In order to obtain atomic samples with larger quantity and lower temperature, further development is needed in doing the second cooling on the basis of the first one to the magnetic part in the Sr atom optical clock system. The main work of this thesis are as follows in two parts.1. Optimize the Zeeman reduction gear magnetic field in the Sr optical clock system. It may contain the analysis of three different implementations of the Zeeman reduction gear magnetic field, the discussion of the affection of the length of the Zeeman reduction gear magnetic field to the slowing effect and the number of atoms trapped .Then we may compute,simulate and optimize the already developed Zeeman reduction gear magnetic field. And we may make test items, do the measurement and have the results.2. We have developed a simple and practical MOT magnetic field control device, under the requirement of controlling and trapping the cold atoms with certain sequence in time ,in the process of the second cooling on the basis of the first cooling. Then we develop and discuss the feasibility of using the computers to do the controlling of Sr optical clock system.