基于分子模拟技术的半导体可饱和吸收体调Q微观机理研究及其优化设计

项目名称： 基于分子模拟技术的半导体可饱和吸收体调Q微观机理研究及其优化设计

项目编号： No.60876056

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 武器工业

项目作者： 李德春

作者单位： 山东大学

项目金额： 36万元

中文摘要： 半导体可饱和吸收体被动调Q开关具有光化学性质和可饱和吸收稳定、热导性好、无退化现象及损伤阈值高等优点；半导体可饱和吸收镜(SESAM)更是具有波长可调、恢复时间和调制深度等参数可以控制的优点，其实现的调Q脉冲宽度最短，是未来固体激光器被动调Q的希望。而半导体可饱和吸收体材料组份、结构复杂，存在多种线性、非线性吸收机制，因此其调Q性能的优化设计非常重要。本项目拟利用分子模拟方法研究其调Q微观机理及性能指标的变化规律，掌握在材料制作过程中控制其非线性损耗、线性损耗、恢复时间和调制深度等调Q参数的方法；通过速率方程理论优化半导体可饱和吸收体和SESAM被动调Q激光器的关键性能参数，获取其调Q效果达到最佳时的性能参数；模拟材料的组份、结构、缺陷及其生长条件，通过分子设计探索新半导体材料的开发途径，为调Q性能最佳的半导体可饱和吸收体和SESAM新材料的开发设计提供规律性依据，填补国内外研究的空白。

中文关键词： 半导体可饱和吸收体；半导体可饱和吸收镜；被动调Q；分子模拟；分子设计

英文摘要： Semiconductor saturable absorber passive Q-switches have the advantages of stable photochemical properties and saturable absorption, good thermal conductivity, no degradation and high damage threshold. Passively Q-switched laser with semiconductor saturable absorber mirror (SESAM) can be wavelength-modulated, and its recovery time and modulation depth can be controled. It is the future of passive Q-switching of solid-state laser.However, Crystal structure of semiconductor saturable absorber materials is complex, there are a variety of linear or nonlinear absorption mechanism. Therefore, the main goal of this study is further understanding the microcosmic mechanism of the GaAs semiconductor saturable absorber and semiconductor saturable-absorber mirror (SESAM) passive Q-switching based on molecular simulation techniques, in order to find the method to control the Q-switched parameters, and design new semiconductor saturable absorber and SESAM materials with optimal Q-switched performance.Using rate equation theory to optimize the key parameters of Q-switched lasers; Using molecular simulation techniques to desigh new semiconductor saturable absorber and SESAM materials with optimal Q-switching performance, to explore the relationship between crystal growth conditions and Q-switching performance parameters, including semiconductor material's composition, structure, doping, growth temperature.

英文关键词： Semiconductor saturable absorber;semiconductor saturable-absorber mirror (SESAM); Passively Q-switched;Molecular simulation; Molecular design