The Investigation Of Spontaneous Emission And Stimulated Emission Properties Of An Atom In Three Optical Devices

We use full quantum theory to investigate the decay distribution of atoms in one-dimensional photonic crystal and the quantum interference property of a V-type three-level atom placed between two parallel plates. In the mean time, the squeezing spectrum of resonance fluorescence of a V-type three-level atom driven by a coherent field and coupled to a cavity is also studied.Through the calculation of the electromagnetic Green's function, we investigate the spontaneous emission behavior from atoms in one-dimensional photonic crystal. We found that the PC effect may lead to the coexistence of both accelerated and inhibited decay processes.The optical Bloch equation of a V-type three-level atom embedded in dielectrics is derived. Because of the vacuum anisotropy induced by the presence of the dielectrics, quantum interference between the two decay channels can still be generated in spite of the two dipole moments of the atom are orthogonal to each other. Moreover, we investigate the case when the atom is placed between two parallel plates and one of the plates is infinitely permeable.Finally, we use resonance fluorescence theory to study the quadrature squeezing spectra in the resonance fluorescence of a V-type three-level atom driven by a coherent field and coupled to a single-mode cavity. The influence on the squeezing spectrum caused by cavity-induced quantum interference is discussed. The result shows, the coupling between the atom and the cavity mode can cause squeezing enhancement. By appropriately tuning the cavity resonant frequency, squeezing in the phase quadratures can be enhanced or reduced.