【作者】 夏宇；

【导师】 李立；

【作者基本信息】 哈尔滨工程大学 ， 光学工程， 2015， 硕士

【摘要】 光学双稳态是非线性光学当中一个非常重要的研究方向,其未来的应用价值,也越来越为人们所关注。在实现光路空间通信的技术中,光学双稳可以用于实现光触发、光开关、光逻辑、光缓存、光计算、光学编码等。另一方面,2微米波段激光处于大气传输窗口,而且人眼安全,是应用于大气光传输和大气光通信的首选光源。在本论文当中,采用速率方程的方法,求解在2微米信号光的作用之下,铥掺杂晶体当中二能级的粒子数目密度变化规律,在此基础之上得到晶体的非线性吸收与折射的表达式。选用法布里-珀罗腔为光学双稳提供反馈作用,采用多光束干涉的方法,推导出考虑到腔体吸收损耗的法布里-珀罗腔的光谱响应,并且把之前得到的掺铥晶体的非线性吸收与折射系数与之相融合,即可得出掺铥晶体外腔反馈光学双稳态的物理模型。在得到方程之后,首先借助于数值计算来模拟光学双稳态的行为,给出典型的光学双稳曲线。改变物理参量,来调节得到的光学双稳态的曲线,并且在此基础之上进行分析。最后,在得到光学双稳态数值解的基础之上,通过恰当的物理近似与假定,通过完全解析的方式,直接求解方程的解析解和物理存在条件,给出描述和表征传输双稳态特征的参量关系。在物理参量间的解析关系上,明确深层次探讨双稳的机理和调节方案。更多还原

【Abstract】 Optical bistability is a very important research direction among nonlinear optics and its application value in the future also attracts more and more attention.Realizing the light path in space communication technology,optical bistability can be used to implement trigger,optical switch,optical logic,light cache,optical computing and optical coding,etc.On the other hand 2 um laser is in the atmospheric transmission window,and the human safety light band which is also applied to atmospheric optical transmission and the best light source for atmospheric optic.In this paper,we use the methods of rate equation and get the solution for the two-level particle number density of thulium doped crystal and nonlinear absorption and refraction expression under 2 um signal light effect.Then selecting Fabry-Perot cavity to provide feedback to optical bistability,using the method of multiple beam interference is deduced considering the cavity in the absorption loss of Fabry-Perot cavity spectral response,and by the nonlinear absorption of thulium doped crystal refractive index and the fusion,external cavity feedback to thulium doped crystal optical bistability physical model.After getting equation,first of all,give the typical optical bistability curve by means of the optical bistability behavior.Then analyze the optical bistability curve by changing the physical parameters.Finally,on the basis of optical bistability numerical solution,through the appropriate physical approximation and assumed that,by means of complete parsing directly parse analyze solution and the physical existence conditions for solving equations,description and characterization of transmission characteristics of bistable parameter is given.On the analyze relationship between the physical parameters,discussed clearly a bistable mechanism and regulation scheme.更多还原