QQ客服 官方微博 反馈留言

题名	超快激光诱导光学薄膜非线性损伤机理研究
作者	李泽汉
学位类别	硕士
答辩日期	2015
授予单位	中国科学院上海光学精密机械研究所
导师	赵元安
关键词	介质膜材料 超快激光损伤 激光预处理 激光泵浦探测
其他题名	Research on the mechanisms in ultra-fast nonlinear laser-induced damage in optical coatings
中文摘要	本文利用不同波长以及不同脉宽的激光探测系统，针对超快激光系统中常用的不同带隙单层膜及高反膜元件，进行了超快激光诱导非线性损伤特性研究，具体工作如下： 本文在传统光学薄膜的损伤测试技术基础上，搭建了具有双光束延迟功能的激光损伤测试系统，并且应用超高分辨率的飞秒泵浦探测系统，得到薄膜元件的导带电子时间分辨吸收演变二维图，以及不同延迟时间的双光束阈值与单光束阈值之比，为研究薄膜元件的超快激光损伤过程提供更高时间分辨率的分析方法和探测手段； 本文通过实验研究，对比了薄膜带隙、基底及制备工艺等影响因素对超快激光非线性损伤的影响，并通过对比不同脉宽激光诱导薄膜的损伤形貌，阐述了超快激光非线性损伤的特点； 本文通过飞秒泵浦探测实验，发现并分析了薄膜材料永久性的本征缺陷态在超快激光非线性损伤中的作用，并通过电子吸收演变图推导出导带以及缺陷态的电子弛豫时间，通过本征缺陷态的引入，修正和改善了非线性离化模型； 本文通过双光束延迟探测实验，发现并分析了薄膜材料瞬时性的激光诱导缺陷态在超快激光非线性损伤中的作用，完善了导带电子弛豫时间的表达形式，并通过超快激光多脉冲损伤实验，分析了激光诱导缺陷态的累积效应，通过深浅两种不同位置的激光诱导缺陷态的引入，进一步修正和完善了非线性离化模型。
英文摘要	This dissertation aims to investigate the ultra-fast nonlinear laser-induced damage (LID) behaviors of commonly used dielectric films, by laser damage testing system with different laser wavelength and laser pulse duration. Following are the main contents of the dissertation: Based on traditional optical films laser damage testing technology, we set up a new laser damage testing system with controllable delay time of double-beam, and use femtosecond laser pump-probe system with high temporal resolution. We get the two-dimensional pseudo-color display of the time dependence of the absorbance changes in films, and the dependency of the double-beam laser-induced damage threshold (LIDT) with the single beam LIDT. We develop a new method with high temporal resolution to explore the ultra-fast laser damage process of dielectric films. We compare the ultra-fast LIDT of dielectric films with different bandgaps, substrates, and preparation technics. By comparing films damage morphology induced by different laser pulsewidth, we interpret the characteristics of ultrafast laser nonlinear damage. By femtosecond laser pump-probe test, we find and analyse the role of the permanent intrinsic defect state in coatings in ultrafast laser nonlinear damage process. By analyzing the two-dimensional pseudo-color display of the time dependence of the absorbance changes in films, we derive the elections relaxation time. By involving the intrinsic defect state, we modify and improve the nonlinear ionization model. By comparing the double-beam damage test of dielectric films in different delay times, we find and analyse the role of the transient laser-induced defect state in coatings in ultrafast laser nonlinear damage process, and improve the expression of the relaxation time of conduction band electrons. By ultra-fast laser multipulse damage test of dielectric films, we analyse the accumulation effect made by the laser-induced defect states in ultra-fast laser damage process. By involving the shallow and the deep defect states, we modify and further improve the nonlinear ionization model.
语种	中文
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/16909]
专题	上海光学精密机械研究所_学位论文
推荐引用方式 GB/T 7714	李泽汉. 超快激光诱导光学薄膜非线性损伤机理研究[D]. 中国科学院上海光学精密机械研究所. 2015.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。