共线双脉冲激光等离子体辐射和动力学特性的实验和理论研究

The experimental and theoretical study on radiation and dynamic characteristic of plasma generated by collinear dual-pulse is very important for pulsed laser deposition (PLD), extreme-ultraviolet (EUV) lithography sources, laser induced breakdown spectroscopy (LIBS) technique, laboratory astrophysics and so on. This project intends to build dual-pulse plasma experimental devices with collinear configuration, and to measure the broad-band spectrum of the plasma based on high-precision spatio-temporally resolved emission spectroscopy technique. It is proposed to develop a theoretical simulation program which can describe the generation, expansion and interaction between two plasmas of collinear dual-pulse plasma. Combined with experimental measurements and theoretical simulations, the interaction mechanism between nanosecond laser and material and the propagation and absorption of nanosecond laser in plasma will be investigated, the interaction mechanism between plasmas will be described, and the radiation and dynamic characteristic of dual-pulse plasma will be revealed. We hope to provide basic and technical support for the application of dual-pulse plasma in related fields.

共线双脉冲激光等离子体辐射和动力学特性的实验和理论研究对脉冲激光沉积、短波光源、激光诱导击穿光谱技术和实验室天体物理等重要应用研究领域具有非常重要的意义。本项目拟搭建高精度、宽波段的共线双脉冲激光等离子体光谱测量装置。发展一套能够统一描述共线双脉冲等离子体产生、膨胀及相互作用过程的理论模拟程序。结合实验测量和理论模拟，研究纳秒激光与物质相互作用及其在等离子体中的传播和吸收机理，描述等离子体之间的相互作用机制，揭示共线双脉冲等离子体的辐射特性和动力学演化规律，期望能够为相关领域的应用研究提供基础和技术支撑。

共线双脉冲激光等离子体辐射和动力学特性的实验和理论研究对脉冲激光沉积、短波光源、激光诱导击穿光谱技术和实验室天体物理等重要应用研究领域具有非常重要的意义。在项目执行期间，项目组基于流体力学方程组、辐射输运方程、热传导方程和激光能量沉积的混合模型(结合了几何光学和波动光学)完全自主化的开发了一套具有单、多脉冲激光等离子体模拟能力的辐射流体力学程序RHDLPP。该程序包含了等离子体的形成及动力学演化、物理参数计算和光谱模拟后处理等模块，能够统一描述单、多脉冲等离子体的产生、动力学演化、辐射及相互作用过程。同时在实验方面搭建了一套集成了瞬态成像测量和激光干涉测量的双脉冲激光等离子体状态诊断装置。结合实验测量和理论模拟，细致研究了激光与物质相互作用及其在等离子体中的传播和吸收机理，探讨了背景气体、背景压强和激光波长等不同实验条件对等离子体动力学演化特性的影响，揭示了共线双脉冲等离子体的动力学演化规律。本项目完成的实验和理论模拟工作能够为相关领域的应用研究提供基础和技术支撑，特别是自主开发的RHDLPP程序已经在激光等离子体极紫外光刻光源的研究中得到了初步应用。