1、 毕业论文毕业论文 激光与晶体的相互作用激光与晶体的相互作用 摘要摘要 :第一台红宝石激光器的发明到现在已经有 50 多年的历史,激光技术一直处于科 学技术研究的活跃领域。五十年来,激光技术无论在理论研究方面还是在实验研究方面都 取得了巨大的进步,并且在实际生产生活得到了广泛的应用。激光与物质特别是与晶体的 相互作用一直是人们研究的课题, 并且形成了分支, 主要有激光与晶体相互作用的热效应、 非线性效应、光子电离等。 本文讨论的是激光与晶体相互作用的非线性效应。介绍了非线性光学效应的发展情 况,讨论了产生非线性光学效应的原理。着重分析了二阶非线性效应,对晶体的二倍频、 三倍频、混频效应在数学上
2、进行了推导。对激光与晶体相互作用的三阶非线性效应作了一 些介绍,比如非线性折射、非线性吸收。进行了一个倍频晶体实验的数值模拟分析,讨论 了提高晶体倍频转换效率的方法。 关键词关键词 :激光;晶体;非线性效应;倍频晶体 AbstractAbstract:The invention of the first ruby laser has now been 50 years of history , laser technology has been in active fields of science and technology research.During the 50 years, la
3、ser technology has made great progress either in terms of theoretical research or in experimental research, and has been widely used in the actual production and living. Laser and material, especially the interaction with the crystal has been that people research topics, and it has formed branches.T
4、he interaction of laser and crystal majorly including thermal effects, nonlinear effects, photon ionization and so on. This article discusses the nonlinear effects of the interaction of laser and crystal. It introduces the development of nonlinear optical effects, discusses the principle of the nonl
5、inear optical effect,primarily analyzes the second-order nonlinear effect,derives second harmonic crystal, the third harmonic mixing effect in mathematics.And it makes some introduction on third-order nonlinear effect about the laser and crystal interaction such as nonlinear refraction, nonlinear ab
6、sorption.Conducting numerical simulation analysis to a frequency doubling crystal, discusses how to improve the conversion efficiency of frequency doubling. Key wordsKey words:Laser; crystal; nonlinear effects; frequency-doubling crystal 目 录 第一章 绪论 . 1 1.1 激光的发展历史及其研究意义 1 1.2 激光与晶体相互作用的概述 2 1.3 本论文的主要内容 2 2.1 非线性光学的发展及介绍 3 2.2 激光与晶体非线性效应的原理 5 2.3 倍频效应 7 2.3.1 晶体的二倍频 . 7 2.3.2 混频效应 . 7 2.3.3 倍频效率 . 8 第三章 三阶非线性效应 . 11 3.1 三阶非线性光学原理概述 11 3.1.1 三阶非线性极化率 . 12 3.1.2 三阶非线性折射率