Electromagnetically Induced Transparency Of A Single A-type Three-level Atom In Cavity

Atomic coherence and quantum interference is one of the most impor-tant research subjects in the field of laser physics and quantum optics. Elec-tromagnetically induced transparency makes an otherwise opaque medium almost transparent. These phenomena display attractively academic and applied values in many fields such as slow light, nonlinearity at low light level, four-wave mixing, light storing and retrieving in quantum informa-tion processing.In this paper, we investigate EIT with single atom in an optical cavity using master equation method. Atom-cavity system was placed in the open environment, the interaction of the system with the environment cannot be neglected. Therefore, we consider the dissipative processes of the system, which include the leakage of photons from the cavity and spontaneous emission from the atom, the reflection of the photons in the cavity and is correspond to the imaginary part of polarizability of the atom. Our result show that three transparency windows appears in cavity EIT when 77 is big enough. It can be found that three windows were determined by pump strengthη. Furthermore, it is shown that the frequency of EIT windows can be tuned by changing the coupling field detuningΔ2 and the reflection profile is very sensitive to the cavity field detuningΔc. Its behavior is similar to the gain of absorption by changingΔc.We summary this thesis in the last chapter and outlook researches in the future.