Quantum-coherent molecular ensembles in plasma

等离子体中的量子相干分子系综

基本信息

批准号：
0904302
负责人：
Howard Milchberg
金额：
$ 67.63万
依托单位：
University of Maryland, College Park
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2009
资助国家：
美国
起止时间：
2009-09-01 至 2013-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0904302&HistoricalAwards=false
关键词：
Quantum coherent molecular ensembles plasma

项目摘要

This award will support continued work based on the recent discovery that coherent rotational wavepackets in oxygen and nitrogen molecules in air can exert surprisingly strong control over high power femtosecond laser filamentation. The wavepackets manifest themselves in air as refractive index lenslets that propagate as quantum echo wakes following the filamenting laser pulse at its group velocity. A secondary pulse injected into these wakes, depending on the injection delay, can either be trapped and steered or scattered out of the beam axis. These results promise to allow much higher filament laser power, greatly extended filament lengths, increased electron density, and enhanced filament continuity, all essential for applications of femtosecond filaments, including terahertz generation, remote ionization, nonlinear light generation and atmospheric monitoring, and channels for electrical discharges. The proposed experiments represent a novel direction in plasma physics of some intellectual merit: the interaction of quantum coherent ensembles with plasmas. The award will also support another set of experiments in laser-nanoparticle interactions. The goal is to control the nanoplasma dynamics with the strong laser ponderomotive force, the high field analogue of inertial confinement.This highly interdisciplinary experimental and theoretical work provides an excellent training experience for graduate and undergraduate students. The physical ideas underlying the experiments, and the diagnostic techniques developed to measure ultrafast processes under extreme conditions, have a broad science and technology impact, from national defense to industry.

该奖项将基于最近的发现，即在空气中的氧气和氮分子中的相干旋转波袋可以支持继续工作，这可以对高功率飞秒激光丝造成出人意料的强大控制。波袋在空气中表现为折射率的镜头，它们在其组速度下以量子的激光脉冲后传播为量子回声。根据注射延迟，可以将其注入这些唤醒中的次级脉冲可以被捕获，转导或散落在梁轴上。这些结果有望允许更高的灯丝激光功率，大大扩展丝的长度，增加的电子密度和增强的丝连续性，这对于飞秒丝的应用，包括Terahertz的产生，远程电离，非线性光生成和大气监测以及电气放电的通道至关重要。提出的实验代表了某种智力优点等离子体物理学的新方向：量子相干合奏与等离子体的相互作用。该奖项还将支持激光纳米粒子相互作用的另一组实验。目的是通过强大的激光浮子力（惯性约束的高场类似物）来控制纳米质量动力学。这项高度跨学科的实验和理论工作为研究生和本科生提供了出色的培训经验。实验基础的物理思想以及在极端条件下衡量超快过程的诊断技术，从国防到工业都具有广泛的科学和技术影响。