Absorption And Dispersion Of V-type Three-level Atoms In A Single-mode Cavity

The study of the absorption and dispersion properties of optical media is caused by the interaction between light and matter.For different substances at present,this property is also the main performance of the properties of matter.The study of the basic absorption and dispersion properties can be explained by the semiclassical theory,but this paper studies the properties of atoms in the cavity,which needs to consider the correlation between atoms and fields,so The full quantum theory is used to explain the calculation.The results of this study have some reference value for the basic physics.In this paper,we study the characteristics of the absorption and dispersion spectrum of the V-type three-level atom in a single-mode cavity.In the process of study,we use the dressed state and get the Langevin equation.At the same time,according to our correlation matrix and coefficient matrix,we get the expression of the absorption and dispersion spectrum we need.Through step-by-step program research,it is found that the absorption and dispersion spectra of two-level atom and V-type three-level atom without cavity are symmetrical and there is no narrow line phenomenon.After adding a single-mode cavity for transition coupling,we found that the absorption and dispersion spectra have a certain interval,and compared with the absorption and dispersion spectra without cavity coupling,there is a narrow line phenomenon.It is also found that the dispersion peak of V-type three-level atom in a single-mode cavity varies with the detuning parameters.Using our research knowledge,we can change the nature of dispersion to change the speed of light in the medium,such as electromagnetically induced transparency in quantum,ultra slow and ultra fast propagation of light,etc.