Lifetime Measurement of 5s5p~3P_1 Metastable State for Sr Atom by Means of TOF Method

In this paper,we give a new method to measure the lifetime of 5s5p3P1 metastable state for Sr atom,based on the TOF method and the absorption spectrum technique.During the experiment,we use the 689 nm laser to pump the Sr atoms of ground state(5s2)1S0 to the 5s5p3P1 metastable state,then we obtain the 688 nm laser absorption spectrums by using the 688 nm probing laser.With these spectrums we change different parameters to obtain a good index decaying curve and then we can get the value of τ.The value of our experimental is(21.9±0.8) μs.The method presented here have a low demand of experimental setup and can get a relatively high precision synchronously.