Abstract
In modern precision atomic spectroscopy, thallium(Tl) plays an important role in testing Parity Nonconservation(PNC). The purpose of this thesis is to study transition between metastable state 6P3/2 and excited state 7S1/2 in atomic beam of Tl using 535nm laser to observe laser-induced fluorescence spectrum from metastable atom. As the thermal distribution of atomic beam, the most population is at ground state 6P1/2, due to the large ground state fine structure splitting. There is nearly no population at 6P3/2 metastable state. To accomplish 535nm spectrum, it is needed optical pumping by 377nm laser to transfer atoms from 6P1/2 to specific energy level with the help of the selection rule. One of the light sources in the experiment is a 377nm laser which is frequency-doubled by a doubling cavity with 755nm Ti-Sapphire laser. The other is a 535nm laser which is also frequency-doubled by a MgO:PPLN with 1070nm Nd:GdVO4 laser. With the characteristics of exciting Tl atom to 7S1/2, 535nm laser can be an important light source of detecting if there is absorption resulting in weak E1-forbidden transition between 6P1/2 and 6P3/2. Using 377nm laser as a selector that optical pumped only some certain hyperfine levels and isotope, this thesis performs 535nm spectrum in atomic beam to clearly resolved all the transitions. We also compared these doppler-free spectrum with the hollow cathode discharge lamp (HCL). These results can be applied to the future experiments of lambda-type laser cooling of thallium and the high resolution atomic beam spectroscopy of the M1 transition of 1283nm for atomic parity violation measurement.