Abstract
Atomic thallium plays an important part in the test of fundamental atomic physics, such as parity nonconservation (PNC) and electron's electrical dipole moment (EDM). The detail understandings of the atomic structure of thallium can further improve the comparison between the experimental and theoretical results. Therefore, the measurement of the hyperfine splitting and isotope shift offer several important informations in such understandings. The 755-nm Ti:sapphire laser is frequency-doubled in LBO crystal with a enhance ring cavity. And we use the second harmonic signal at 377 nm to pump the thallium energy level from 6P1/2 to 7S1/2. In order to reduce the Doppler effect, the laser light must overlaps perpendicularly the thallium atomic beam. The linewidth of Tl 6P1/2 →7S1/2 transition is measured as 32 MHz. It matches the theoretical prediction. The isotope-shift of Tl 6P1/2 →7S1/2 transition is 1659.3 MHz In the future, we will use the second laser source with the same setup to pump the thallium transition from 6P3/2 to 6D5/2 and use the femtosecond comb system to measure the absolute frequency of the thallium transitions.