基于光纤传感技术的飞秒激光等离子体冲击波的动力学特性研究

项目名称： 基于光纤传感技术的飞秒激光等离子体冲击波的动力学特性研究

项目编号： No.51275373

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 童杏林

作者单位： 武汉理工大学

项目金额： 83万元

中文摘要： 激光等离子体冲击波动力学特性是激光冲击成形、激光诱导核聚变和激光推进等应用机理中尚待弄清楚的重要课题。针对激光产生等离子体冲击波进展的复杂性，本项目拟采用旋转椭球面波模型对飞秒激光等离子体冲击波的动力学过程进行描述，研究微尺度下飞秒激光等离子体冲击波的时空变化规律；并利用光纤F-P声发射传感探针在线监测飞秒激光烧蚀靶材产生等离子体冲击波的动力学过程，获得激光等离子体冲击波声学频率与强度的时空历程，探索激光能量密度与脉冲频率等参数对飞秒激光等离子体冲击波力学效应的影响，根据实验结果完善理论模型。预计能建立一种真实描述飞秒激光等离子体冲击波动力学过程的数学物理模型，同时获得一种利用光纤F-P声发射传感探针在线监测飞秒激光等离子体冲击波动力学过程的新原理、新技术。在这一领域开展研究，对推动激光冲击波控制技术的应用具有重要的科学价值。

中文关键词： 光纤传感；飞秒激光；等离子体冲击波；机理模型；信号处理

英文摘要： Laser plasma shock wave dynamic characteristics is an important subject of laser shock forming, laser cleaning, laser-induced nuclear fusion and laser shock application mechanism which ramains to be solved. According to the complexity of laser producing plasma shock wave progress, the project plans to describe femto-second laser plasma shock wave dynamics peocess by using rotation ellipsoid plasma shock model, reaserch the space-time change law of femto-second laser plasma shock wave in microscale. The project tries to use all glass optical fiber F-P acoustic sensing probe on-line monitor the dynamics process of laser plasma shock wave which is produced by femto-second laser performs on solid targets, obtains the accoustics frequency and intensity information of laser plasma shock wave space-time process, and explores the influence of factors such as laser energy density and pulse frequency on laser plasma shock wave mechanical effect. Based on the experimental results, we perfects the theoretical model. A kind of mathematical physics model is predicted to be built which can really describe femto-second laser plasma shock wave dynamic characteristics and at the same time the new principle and novel technologies of on-line monitoring femto-second laser micro-plasma shock wave dynamics process by using fiber optic

英文关键词： optical fiber sensing；femtosecond laser；plasma shock wave；mechanism model；signal processing