Electromagnetically Induced Transparency Simulation in Ladder-type Modified Three-level System

• Main Authors: Hang Nguyen ThiThu, 阮氏秋恒
• Other Authors: Chin-Chun Tsai
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/339dny

碩士 === 國立成功大學 === 物理學系 === 106 === In this research, we firstly present the interaction of light and atoms in the simplest way that is the two-level system by solving the optical Bloch equation to get the solution of density matrix components. We subsequently use numerical simulation to describe the probability of atom being in the ground state and the excited state, as well as the influence of absorption of light with changing the frequency of laser field for various Rabi frequencies. Furthermore, the optical Bloch equation is applied into the ladder-type three-level system with two external fields (a weak probe field and a strong coupling field), and the solution of density matrix is presented after solving numerical method in steady state condition. The purpose of this research is to present numerical simulation results of Electromagnetically Induced Transparency (EIT) in ladder-type three-level system for the 6^2 S_(1/2)-6^2 P_(3/2)-〖11〗^2 S_(1/2) transition of 133Cs atom. Moreover, influences of the Rabi frequency of coupling field and Doppler effect in EIT are also presented. Finally, an additional driving field is introduced into ladder-type three-level system to form a modified three-level system which involves two-photon coherence. We obtain the four-wave mixing (FWM) signal with various Rabi frequencies of driving field and the three-photon electromagnetically induced absorption (TPEIA) signal. A comparison between EIT and TPEIA with the change of Rabi frequency of the driving field is also illustrated in this research.