中红外可调谐飞秒激光脉冲驱动产生远程激光辐射的机理与应用研究

项目名称： 中红外可调谐飞秒激光脉冲驱动产生远程激光辐射的机理与应用研究

项目编号： No.11204332

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 姚金平

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 30万元

中文摘要： 随着人类对环境污染和国家安全问题的关注，大气污染远程探测、核辐射泄漏的早期识别已经成为当前科学研究的热点问题之一。飞秒激光成丝，由于具有承载光强高、穿透能力强、光斑模式好、传输距离远的特点，在大气遥感、有毒有害物质识别等方面具有重要的应用价值。特别是，飞秒激光成丝诱导的远程空气激光的发现，为解决远距离探测的灵敏度和信息量等关键问题提供了有效途径。然而，由于泵浦光源的限制，目前远程激光的研究主要以氮气和氧气为增益介质，对于其他气体和污染物的研究较少。另外，远程激光通常以单一波长或多波长的模式运转，不借助光学元件，难以实现波长的切换和调节，不具备远程操控的能力。基于以上研究背景，本项目拟利用中红外可调谐飞秒激光脉冲在多种气体和污染物中产生高亮度、波长可切换的远程激光辐射。通过研究该远程激光形成的机理以及实际应用，探索中红外强场原子分子物理的新原理、新规律，并发展一种全新的非线性光谱技术。

中文关键词： 飞秒激光成丝；空气激光；泵浦-探测；远程探测；

英文摘要： Nowadays, due to more and more attention paid to environment pollution and national security, both remote monitor of pollutants and early detection of nuclear reactor radiation leak have become one of hot issues in scientific research. Femtosecond filamentation offers a promising way for remote sensing and detection of hazardous substances due to its excellent characteristics, such as high laser intensity inside the filament, strong penetrability, excellent beam quality and long propagation distance. In particular, remote air lasing induced by filamentation makes it possible to improve sensitivity and information content retrieved by the return signal. However, remote lasing is usually generated with nitrogen or oxygen as the gain medium. So far, few research focus on other gases and pollutants because of the limitation of pump sources. Furthermore, current remote lasing usually operates at either single wavelength or multiple wavelengths. It is difficult to switch between multiple wavelengths without using any optical components and thus it cannot be effectively controlled at the location of pump sources. In order to solve these problems above, this project will focus on remote lasing driven by mid-infrared tunable femtosecond laser pulses in multiple gases and pollutants. We will attempt to obtain high-brightn

英文关键词： femtosecond laser filamentation；air lasers；pump-probe；remote detection；