The Coherent Effect Of Thermal Atoms And Its Experimental Research And Application

Quantum coherence spectroscopy has long been a vital topic in the study of quan-tum optics and laser spectroscopy.With the continuous exploration of the theory and experiment of atomic precision spectroscopy,researchers also have a more thorough understanding of the nature of atomic coherence effects(EIT,EIA,CPT,SAS,etc).At the same time,at,omic cohe.rence effect has been widely use.d in precision measure-ment(such as:atomic clock,magnetometer)and other fields.The coherent effect of atoms is produced by the interaction between atoms and coherent electromagnetic fields.The physical mechanism of atomic coherence effect is that the correlation effect between different e.nergy levels of atoms is caused by the action of coherent electro-magnetic field,so that the transition channel of different energy levels of atoms has interfe.rence e.ffe.ct.In the theoretical and experimental basis of coherent spectroscopy and in the con-text of the application in the field of precision measurement,the work of this thesis is as follows:firstly,the absorption spectra of the standard Lambda atomic model and the characteristics of the absorption spectra of the thermal atoms abstracted as Lambda atoms are deduced and analyzed by using the perturbation theory,and the physical mechanism of the narrow line width of the thermal atoms is studied;then,the problem of laser frequency jitter and the steady frequency technology using thermal atom coherent spectrum are studied,and a laser frequency stabilization method with relatively small frequency jitter is proposed by using the sub-natural line width ab-sorption spectroscopy of thermal atoms;finally,the magnetic resonance spectroscopy experiment is realized by using a stable laser system and the data analysis is made.