基于四能级原子系统模型增益媒质激光原理研究  

Analysis of lasing in gain medium based on four-energy level atomic model

作　　者：孙兵兵[1] 吴博[1] 王辉[1] 黄志祥[1] 吴先良[1,2] 

机构地区：[1]安徽大学电子信息工程学院智能计算与信号处理重点实验室,合肥230039 [2]合肥师范学院物理电子系,合肥230061

出　　处：《物理学报》2012年第22期33-39,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60931002;61101064;51277001);安徽省杰出自然科学基金(批准号:1108085J01);安徽省高校自然科学基金(批准号:KJ2011A002;KJ2011A242);安徽大学211工程资助的课题~~

摘　　要：作为超材料研究中的重点,增益媒质因其放大特性而表现出良好的应用前景.本文基于四能级原子结构系统模型,引入一种全新的抽运机理:高斯抽运.用时域有限差分方法对增益媒质激光产生原理进行模拟计算.数值模拟结果表明,该模型和新抽运机理的频谱特性、阈值特性以及动态演化过程和理论分析一致.研究结果可为计算更复杂超材料系统提供参考.With the present interest in metamaterial, gain medium shows promise for complex system due to their amplification effect and wide potential application area. In this paper we present a model that simulates lasing in gain medium by using a model of four-energy level atomic system based on the finite-difference time-domain method.Meanwhile we propose a new pump mechanism, i.e., Gaussian Pump. It is found that results of the spectra, lasing threshold and population dynamics of the new pump mechanism are in good agreement with theoretical results. The results can also provide reference for caculating more complex metamateriai system.

关 键 词：四能级原子系统 时域有限差分 增益媒质 激光 

分 类 号：TN241[电子电信—物理电子学]