Study on the Gain Material with Four Energy Level Model Using FDTD Method
Study on the Gain Material with Four Energy Level Model Using FDTD Method作者机构：1Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei China 2Department of Physics and Electronic Engineering Hefei Normal University Hefei China Key Laboratory of Intelligent Computing and Signal Processing Anhui University Hefei China
出 版 物：《Optics and Photonics Journal》 (光学与光子学期刊（英文）)
年 卷 期：2013年第3卷第2期
页 面：15-20页
学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学]
主 题：Finite-Difference Time-Domain Gain Material Lasing
摘 要：A faster numerical method based on FDTD for the four energy level atomic system is present here. The initial conditions for the electrons of each level are achieving while the fields are in steady state. Polarization equation, rate equations of electronic population and Maxwell’s equations were used to describe the coupling between the atoms and electromagnetic wave. Numerical simulations, based on a finite-difference time-domain (FDTD) method, were utilized to obtain the population inversion and lasing threshold. The validity of the model and its theory is confirmed. The time, which we can observe the lasing phenomenon, is much shorter in our new model. Our model can be put into using in large scale simulations in mutiphysics to reduce the total simulated time.
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