项目名称： 飞秒激光成丝在云室中诱导降雪物理机制的实验和理论研究

项目编号： No.61475167

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 孙海轶

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 82万元

中文摘要： 飞秒激光成丝诱导水凝结是近年来在飞秒强激光成丝应用领域中出现的一个新的研究课题。鉴于飞秒强激光在大气中能够实现几公里甚至几十公里的长距离自导引传输，这方面的研究将为基于飞秒强激光技术的大气环境局部天气的控制提供极具潜力的新途径，具有重要的科学意义和应用前景。本项目围绕目前研究甚少的凝结核长大直到可以沉降的后期过程，将实验研究和数值模拟紧密结合，开展飞秒激光成丝在云室中诱导降雪的物理机制研究。具体内容包括：研究飞秒激光成丝诱导降雪过程中气流的运动过程，揭示形成不同形态气流的关键影响因素；探测凝结核长大的微观物理过程，确定不同形态气流运动在凝结核长大过程中所起的作用；进一步考虑飞秒激光成丝带来的电离效应，发展和完善现有数值模型，理论方面探究降雪形成的物理机制。目标是为进一步提高飞秒激光成丝诱导水凝结的效率提供参考，从而推动相关应用领域的发展。

中文关键词： 飞秒激光成丝；水凝结；降雪；气流运动；凝结核

英文摘要： Femtosecond laser filamentation-induced water condensation is a new research topic in the application fields of femtosecond laser filamentation in the recent years. This would provide a new and potential way for the local weather control in the atmospheric environment based on the technique of femtosecond intense laser considering of its ability of being able to propagate in air for a long distance of several even tens of kilometers as a self-guided filament, and denotes important scientific significance and potential applications. This project would investigate the mechanisms of femtosecond laser filament-induced snowfall in a cloud chamber by combining experimental study with numerical simulation, focusing on the later process of condensation nuclei growing to fall which has been hardly investigated so far. The research contents include: studying on the process of air motion with different patterns induced by femtosecond laser filament in a cloud chamber and revealing their key influence factors; investigating the microscopic growing process of condensation nuclei and showing the role of air motion with the different patterns in this process; considering of the ionization effect induced by femtosecond laser filamentation, and developing the present numerical model to explain the mechanisms of snowfall. The goal is to increase the efficiency of femtosecond laser filamentation-induced water condensation, consequently accelerate the development in the related application fields.

英文关键词： femtosecond laser filamentation;water condensation;snowfall;air motion;condensation nuclei