Intense Laser-Atom Physics in Scaled Interactions

尺度相互作用中的强激光原子物理

• 批准号: 0653022
• 负责人: Louis DiMauro
• 金额: $ 58.16万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0653022&HistoricalAwards=false
• 关键词: Intense; Laser; Atom; Physics; Scaled

This project undertakes a comprehensive study of the single atom response under novel interaction conditions that will not only provide basic tests of scaling laws and theory but also initiate some unique experimental investigations in strong field physics. The overall objective of the project is to broaden the scope of experimental investigations by utilizing the wavelength scaling of the strong field interaction in the regime where the photon energy is much smaller than the atomic binding energy. Various aspects of the strong-field interaction have an implicit wavelength-dependence that is a crucial scaling parameter and has not been explored or exploited in a systematic fashion. Addressing these scaling laws with novel ionization experiments using few-cycle mid-infrared (2 micron and 4 micron wavelength) pulses is crucial since it tests the very foundations of all our understanding of the intense laser-atom interaction. Using these principles a number of key studies will be enabled and include significantly increasing the number of atomic systems capable of experiencing intense laser fields, allowing systematic studies of one- and two-electron systems, and examining strong field interactions for prepared states and initiate a global investigation of scaling laws.The interaction of an isolated atom with an intense electromagnetic field is the basis for one of the forefront problems in atomic, molecular and optical physics. The ability to couple large amounts of energy into an atom by the absorption of many photons posed many intriguing questions and has led to many new discoveries such as above-threshold ionization, high-harmonic generation, multiple ionization and adiabatic stabilization. At the core of the problem is the non-perturbative response of the atom to a laser pulse that imposes an external field comparable to the forces binding the electrons to the nucleus. The continuing interest in this fundamental atomic physics problem is derived from its broad implications in other areas of physics and technology. The single atom response is the initial condition of more complex phenomena found in plasmas, inertial confined fusion concepts, advance particle acceleration and astrophysics. The intense laser-atom interaction itself is opening new opportunities in short wavelength science, quantum control and advancing an emerging discipline in hyperfast electron physics, attophysics. Recently, the optical techniques used for producing the ultra-fast laser pulses for these studies have reached a level of sophistication where the electromagnetic field can be completely determined, i.e. absolute phase and amplitude. Furthermore, the interdisciplinary nature of this research coupled with state-of-the-art ultra-fast optical technology provide an excellent training ground for both undergraduate and graduate students.

该项目对新的相互作用条件下的单原子响应进行了全面的研究，不仅提供了标度律和理论的基本测试，而且还启动了强场物理学中一些独特的实验研究。该项目的总体目标是通过利用强场相互作用在光子能量远小于原子结合能的情况下的波长标度来扩大实验研究的范围。强场相互作用的各个方面都有一个隐含的波长依赖性，这是一个关键的标度参数，并没有被探索或利用系统的方式。使用几个周期的中红外（2微米和4微米波长）脉冲进行新的电离实验来解决这些标度律是至关重要的，因为它测试了我们对强激光-原子相互作用的所有理解的基础。利用这些原理，将能够进行一些关键研究，包括显著增加能够经历强激光场的原子系统的数量，允许对单电子和双电子系统进行系统研究，和检查强场相互作用的准备状态，并启动全球调查的标度律。一个孤立的原子与强电磁场的相互作用是基础，其中一个前沿原子、分子和光学物理问题。通过吸收大量光子将大量能量耦合到原子中的能力提出了许多有趣的问题，并导致了许多新的发现，如阈上电离，高次谐波产生，多次电离和绝热稳定。问题的核心是原子对激光脉冲的非微扰响应，激光脉冲施加的外部场与电子与原子核的结合力相当。对这个基本原子物理学问题的持续兴趣来自于它在物理学和技术的其他领域的广泛影响。单原子响应是等离子体、惯性约束聚变概念、先进粒子加速和天体物理学中发现的更复杂现象的初始条件。强烈的激光与原子相互作用本身正在为短波长科学、量子控制开辟新的机会，并推动超快电子物理学、原子物理学等新兴学科的发展。最近，用于产生这些研究的超快激光脉冲的光学技术已经达到了可以完全确定电磁场的复杂程度，即绝对相位和振幅。此外，这项研究的跨学科性质加上最先进的超快光学技术为本科生和研究生提供了一个很好的培训基地。