The Improvement Of The Strontium Optical Clock’s Experimental System And Lifetime Measurement Of The5s5p³P₁energy State Of Strontium

Strontium is highly promiseful in optical frequency standards and high resolutionspectroscopy owing to the narrow line width of（5s²ï¼‰¹S_Ï…â†'5s5p³P₁intercombinationtransition. It’s transition line type which has been recommended to be the secondary frequencystandard has a high value of Q and other inherent beneficial factors. Based on all of thisadvantages, the strontium optical clock may become the new frequency standard prospectively.During the preparation of strontium optical clock，we should pursue detailed analysis of allof the correlative physical parameters to carry through the whole design and the control of theexperimental system.This research based on both of our former and new experimental system. First，consideringthe irrepealable limitation of the former experimental system，we upgrade it and construct anew experimental system. Besides，based on the old system，we design and actualize the controlof the magnetic field in magnetic optical trap （MOT），and then we utilize the method ofZeeman scanning to complete the measurement of the speed distributing of atoms.Then，based on the new experimental system，we utilize the TOF method together with theabsorption measuring method to obtain a lifetime measurement of the5s5p³P₁energy state ofstrontium. This lifetime measurement yielded a value of Ï„=21.9±0.8μswhich is analogouswith other current experimental values established in literature. The new experimental systemstands in vivid contrast against the former one, and it creates a good foundation for thesubsequent first and second cooling of strontium atoms as well as the finally experimentalfacture of the strontium optical clock.