Time-Domain Characterization of Macroscopic Quantum Systems via High Harmonic Generation

通过高次谐波产生宏观量子系统的时域表征

基本信息

  • 批准号:
    1403236
  • 负责人:
  • 金额:
    $ 27万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2014
  • 资助国家:
    美国
  • 起止时间:
    2014-06-01 至 2017-11-30
  • 项目状态:
    已结题

项目摘要

High harmonic generation (HHG) is a highly nonlinear process by which laser light with a wavelength in the infrared regime can undergo frequency up-conversion into the extreme ultraviolet (XUV) or even soft X-ray regime. HHG is also at the heart of the production of attosecond pulses, which are the shortest bursts of light ever produced, with durations that are more than a billion times shorter than a microsecond. The natural application of attosecond pulses is in the study of electron dynamics, which occurs on this time scale. Several decades of work have been dedicated to the development and application of attosecond light sources, and the proposed work addresses aspects of both development and applications. One of the proposed projects involves the study of ultrafast correlation between electrons during HHG in an atom. The correlation is expected to impart a signature on the time structure of the emitted attosecond XUV radiation. This project thus uses the process of HHG as a probe of the underlying electron dynamics. In another project HHG and attosecond pulse production in transparent solids, which have recently been experientally found to produce relatively high order harmonics, will be investigated. Although the process of HHG in dilute atomic gases is well understood, the efficiency of and the mechanism by which HHG are produced in these transparent solids is largely unknown. This project is thus a study in attosecond source development. All the proposed projects will be undertaken through large-scale calculations within a theoretical framework in which it is possible to describe the HHG process from the ab-initio quantum level to the macroscopic production of a measurable electric field. The proposed work will involve several new theoretical developments as well as a number of applications of the existing theoretical framework. The calculations envisioned are ambitious and will represent the state-of-the-art for the theory and computation of ultrafast laser-matter interactions. The majority of the proposed work is directly relevant to ongoing collaborations with experimental groups at the forefront of ultrafast strong field physics. The broader impacts of this project are diverse and involve the development of both scientific and human resources: (i) The development and application of ultrafast, coherent XUV sources further our fundamental understanding of the dynamics of atomic, molecular, and biological processes at the few-femtosecond and sub-femtosecond time scale, (ii) the proposed work helps to maintain a presence of ultrafast AMO science in the US while the field is generally dominated by groups in Europe, Asia, and Canada, and (iii) human resources will be developed through involvement, training, and mentoring of junior researchers such as undergraduate and graduate students and postdocs. The PI, who is female, is also actively involved in mentoring women in physics, in particular at the undergraduate level.The research in this proposal centers on the study of ultrafast quantum dynamics through the strong-field production of high order harmonics and attosecond pulses in different macroscopic non-linear media. In particular, the work proposed is to study (i) the time-domain effects of correlation in two-electron systems through the characteristics of high order harmonics in the vicinity of auto-ionizing resonances, and more generally the effects of resonances (in one- or two-electron systems) on the microscopic and macroscopic properties of the harmonic radiation, (ii) high harmonic generation (HHG) in periodic media (transparent solids) which has recently been experimentally demonstrated, and (iii) HHG driven by mid-infrared laser pulses, in terms of their potential as a source of kiloelectron volt attosecond pulses. Some of these studies center on characterizing the inherent dynamics of the strong-field interaction with the quantum system, such as correlation, or the nature of the coherent process that leads to harmonics in solids. Other studies aim to characterize or optimize the properties of the VUV/XUV light itself. The proposed work will be accomplished through the continued development and application of an ab-initio, non-adiabatic theoretical model for ultrafast laser-matter interactions. This "numerical non-linear medium" (NNLM) allows for the complete simulation of the most advanced short pulse laser experiments from first principles. The NNLM is based on the coupled solutions of the time-dependent Schroedinger equation and the Maxwell wave equation with sub-cycle precision, and requires large scale computations.
高次谐波产生(HHG)是一种高度非线性的过程,通过该过程,波长在红外区域的激光可以被频率上转换为极紫外(XUV)甚至软X射线。HHG也是产生阿秒脉冲的核心,阿秒脉冲是有史以来产生的最短的光脉冲,持续时间比微秒短10亿多倍。阿秒脉冲的自然应用是研究电子动力学,它发生在这个时间尺度上。几十年来一直致力于阿秒光源的开发和应用,拟议的工作涉及开发和应用的各个方面。其中一个拟议的项目涉及研究原子中高次谐波过程中电子之间的超快关联。这一关联有望给出阿秒XUV辐射的时间结构的特征。因此,这个项目使用HHG的过程作为潜在电子动力学的探测器。在另一个项目中,将研究在透明固体中产生高次谐波和阿秒脉冲,这是最近被经验发现产生相对高次谐波的。虽然在稀薄原子气体中产生氢化物的过程已被熟知,但在这些透明固体中产生氢化物的效率和机制在很大程度上是未知的。因此,该项目是对阿秒震源发展的研究。所有拟议的项目都将在一个理论框架内通过大规模计算进行,在该理论框架中,可以描述从从头算量子水平到可测量电场的宏观产生的HHG过程。拟议的工作将涉及几个新的理论发展以及现有理论框架的一些应用。设想的计算是雄心勃勃的,将代表超快激光-物质相互作用理论和计算的最先进水平。大多数拟议的工作与正在进行的与处于超快强场物理前沿的实验小组的合作直接相关。该项目的广泛影响是多样的,涉及科学和人力资源的开发:(I)超快、相干的XUV源的开发和应用加深了我们对几飞秒和亚飞秒时间尺度上的原子、分子和生物过程动力学的基本理解;(Ii)拟议的工作有助于保持超快AMO科学在美国的存在,而该领域通常由欧洲、亚洲和加拿大的团体主导,以及(Iii)人力资源将通过参与、培训和指导初级研究人员,如本科生、研究生和博士后来开发。PI是一名女性,她还积极参与指导女性物理,特别是本科水平的女性。这项建议的研究集中在通过在不同宏观非线性介质中产生高次谐波和阿秒脉冲的强场效应来研究超快量子动力学。特别是,拟议的工作是研究(I)通过自电离共振附近的高次谐波的特征来研究双电子系统中的关联的时域效应,以及更广泛地说(在单电子或双电子系统中)共振对谐波辐射的微观和宏观性质的影响,(Ii)最近已被实验证明的在周期介质(透明固体)中的高次谐波产生(HHG),以及(Iii)由中红外激光脉冲驱动的HHG,其作为千电子伏特阿秒脉冲的源的潜力。其中一些研究集中在描述强场与量子系统相互作用的内在动力学,如关联,或导致固体中谐波的相干过程的本质。其他研究旨在表征或优化VUV/XUV光本身的特性。拟议的工作将通过继续发展和应用超快激光-物质相互作用的从头算非绝热理论模型来完成。这种“数值非线性介质”(NNLM)允许从第一性原理完全模拟最先进的短脉冲激光实验。NNLM基于含时薛定谔方程和麦克斯韦波动方程的耦合解,具有亚周期精度,计算量大。

项目成果

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Mette Gaarde其他文献

Mette Gaarde的其他文献

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{{ truncateString('Mette Gaarde', 18)}}的其他基金

Theory of High Harmonic Generation in Solids and Gases, at the Microscopic and the Macroscopic Level
微观和宏观层面的固体和气体高次谐波产生理论
  • 批准号:
    2110317
  • 财政年份:
    2021
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
Microscopic and Macroscopic Aspects of High Harmonic Generation
高次谐波产生的微观和宏观方面
  • 批准号:
    1713671
  • 财政年份:
    2017
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
2010 Multiphoton Processes Gordon Research Conference will be held June 6-11, 2010 at the Tilton School, Tilton, New Hampshire
2010 多光子过程戈登研究会议将于 2010 年 6 月 6 日至 11 日在新罕布什尔州蒂尔顿的蒂尔顿学校举行
  • 批准号:
    1016148
  • 财政年份:
    2010
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
Macroscopic Aspects of Ultrafast Strong-Field Atomic Physics
超快强场原子物理的宏观方面
  • 批准号:
    1019071
  • 财政年份:
    2010
  • 资助金额:
    $ 27万
  • 项目类别:
    Continuing Grant
2008 Multiphoton Processes Gordon Conference, June 8-13, Tilton, NH
2008 多光子工艺戈登会议,6 月 8 日至 13 日,新罕布什尔州蒂尔顿
  • 批准号:
    0810402
  • 财政年份:
    2008
  • 资助金额:
    $ 27万
  • 项目类别:
    Standard Grant
CAREER: Theory of attosecond pulse generation
职业:阿秒脉冲产生理论
  • 批准号:
    0449235
  • 财政年份:
    2005
  • 资助金额:
    $ 27万
  • 项目类别:
    Continuing Grant

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