Experimental Research On Two-photon Pumped Alkali Metai Blue Laser

Blue laser has very broad applications in underwater communication,fluorescence excitation and high density information storage.In several of the current methods for producing blue lasers,the two-photon’s four-wave mixing process can be directly converted from pump laser to blue laser,which has attracted widespread attention from scholars at home and abroad in recent years.The research content of this thesis is divided into two parts.Firstly,in the research of two-photon excitation(TPE)and four-wave mixing effect(FWM)of rubidium atom 5251/2→72S1/2,it was found that there is a broad-spectrum near the resonance position which is significantly higher than the empirical value.Based on this result,the possible influence of the hyper-Raman effect(HRE)under two-photon resonance enhancement on the rubidium high-level system is proposed for the first time.Meanwhile,the 420.3 nm and 420.3 nm FWM laser obtained by this process are given.Secondly,in the study of rubidium atoms 52S1/2→62D3/2 and 52S1/2→62D5/2,it was found that some part of the fluorescence signal whose wavelength is significantly longer than the wavelength of pump laser.Based on this result,the possible influence of Energy-pooling effect on the rubidium high-level system is proposed for the first time.At the same time,the anomalous transition of 62D5/2→62P1/2 was observed for the first time when the system temperature was 185℃,which further confirmed the hyper-Raman effect(HRE).In addition,in this experiment,the blue and ultraviolet laser output of 358.7nm,359.1nm,420.3nm and 421.7nm was realized for the first time.