AC Stark Shift And Atomic Porlarizability Of Cecium Atom In Two Light Fields

Ac Stark Shifts refers to the reflection of the energy level shift as the dynamic polarization energy obtained by atoms in the non-zero frequency electric field.Adiabatic approximation is one of the most commonly used in the multilevel system,which produces an effective Hamiltonian.However,in most cases,there maybe non-hermitian effective Hamiltonian during the research.Therefore,another commonly used research method,non adiabatic elimination method is briefly introduced in this article in research of multi-level systems in Quantum Optics.In order to study Ac Stark shift and atomic porlarizability of cecium atom in two light fields,brief introduction to the Ac Stark effect is also involved in the first chapter.Based on the these introduction,this article deduces the displacement of the Ac Stark energy level of the two-level atom under single mode action,including the use of the singular perturbation method in the non-adiabatic elimination method to simplify the energy level model,and the correlation expression of the Ac Stark shift is derived.Finally,on the basis of some approximation process of circularly polarized light,the thesis also demonstrates the polarization of ground and excited states of a three-level atom under the action of left-handed and right-handed circularly polarized light.Besides,the relative expressions of scalar,vector and tensor components in dynamic polarization are displayed as well as a large number of transitions of the matrix elements of are reduced during the process.This paper takes the cesium atom as an example to calculate the polarized capacity of scalar,vector,and tensor of the cesium atom through resonant wavelengths and the corresponding results are systematically presented,and the results of the calculation are discussed.