Abstract
We studied the spectrum of Rydberg state electromagnetic induced transparency (EIT) in the low temperature regime (300μK) with 87 Rubidium atoms. Our EIT system is composed of a probe field, which drives the transition from ground state to a 5P3/2 excited state, and a coupling field, which drives the transition from 5P3/2 excited state to Rydberg state. In the first part (CH1), we introduce the characteristic of Rydberg atoms. Principle quantum number is one of the important parameters of Rydberg atoms, which is associated with many physical quantities. The relation between them would be explained in this part. The second part (CH2, 3, 4) can be divided into two pieces, theory and experiment. The theoretic part is about the theory of EIT and the method of preparing cold atom. The experimental part would explain the setup of magnetic optical trap (MOT) and the way how to optimize the lambda type EIT system in detail, which gives us the solid base of researching Rydberg state EIT. The final part (CH5) is the most important experimental result of Rydberg state EIT spectrum. We would verify whether or not Rydberg state EIT spectrum behavior is still the same as the one in lambda type EIT. Further, we can follow the same way in CH4 to optimize the Rydberg state EIT system.