Modeling Simulation of Ladder-type Electromagnetically Induced Transparency in Cesium Atoms

Abstract

In this thesis the basic knowledge that will be used for deriving the optical Bloch equation is introduced Then the features of the interaction between light and medium in two-level system are obtained Finally the optical Bloch equation is applied to three-level system with two external fields for simulating the quantum interference phenomena of electromagnetically induced transparency (EIT) and the property of absorption coefficient is measured and combined into the theoretical model In order to make this pristine theoretical model matches the experimental spectra Doppler effect due to the contribution of each velocity group under Maxwellian distribution is taken into consideration and thus the frequency mismatch owing to the probe and coupling fields acting on the same velocity group of atoms is acquired The key point is presenting a theoretical model to study the ladder-type EIT of cesium atoms by locking the probe field at each dipole-allowed transitions and scanning the coupling field to access the higher excited state Optical Bloch equation tow-photon transition probability and optical pumping effect which redistributes the relative population in the magnetic Zeeman sublevels are concerned and constitute our theoretical model The state of the probe and coupling polarization is a pivotal factor for fitting the experimental data since the population of different Zeeman sublevels and the weighting of each EIT path will be significantly affected by the state of polarization This theoretical model accurately reproduced the measured EIT spectra for all the possible transitions in the three-level system However for the higher power of the probe and coupling fields the results only can be concluded as a qualitative one The EIT spectra with varying the power have to be further investigated

Date of Award	2018 Jul 6
Original language	English
Supervisor	Chin-Chun Tsai (Supervisor)