MRI: Acquisition of an Amplified Ultrashort-Pulse Laser System for Ultrafast and Spectroscopic Studies of Condensed Matter Systems

MRI：获取用于凝聚态系统超快和光谱研究的放大超短脉冲激光系统

• 批准号: 0115981
• 负责人: Thomas Donnelly
• 金额: $ 22.78万
• 依托单位: Harvey Mudd College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-01 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0115981&HistoricalAwards=false
• 关键词: MRI; Acquisition; Amplified; Ultrashort; Pulse

This award from the Major Research Instrumentation Program will allow Harvey Mudd College to acquire laser system to support research on the ultrafast dynamics of electrons in metals and on the nonlinear optical behavior of ultrathin semiconductors and metals. The system will produce a femtosecond laser beam at a repetition rate of one kilohertz. This will greatly facilitate pump-probe measurements to monitor the non-equilibrium distribution of photoexcited electrons in metals. These measurements will provide information on both the energy- and momentum-scattering rates in metals and permit quantitative comparison to theories of electron dynamics in metals. Through continuum generation and frequency shifting, the laser system will allow spectral characterization of the nonlinear optical response of thin semiconductor films, providing valuable information on the strength of both bulk and surface sources of second-harmonic generation in centrosymmetric semiconductors. Undergraduate students will be trained in the operation of this state-of-the-art femtosecond laser facility. It will also be available as a resource to the members of the Claremont ConsortiumThis award from the Major Research Instrumentation Program will allow Harvey Mudd College to acquire laser system to support research on the ultrafast dynamics of electrons in metals and on the nonlinear optical behavior of ultrathin semiconductors and metals. The high density of mobile electrons inside a metal causes electrons to interact on extremely fast time scales. A detailed understanding of these interactions is important for understanding how metals catalyze chemical reactions and how atoms adsorb on metal surfaces. The new laser system will permit researchers at Harvey Mudd College to perform time-resolved measurements of the changes to the electronic system in a metal caused by an intense pulse of laser light lasting less than fifty femtoseconds (1 fs = 10-15 s). These measurements will provide information on both the energy- and momentum-scattering rates in metals and permit quantitative comparison to theories of electron dynamics in metals. The laser system can provide useful information on both the structures of the semiconductor crystal and on the quality of surfaces. Spectroscopic study of the harmonic response will provide useful information on the relative importance of surface and bulk phenomena and will permit detailed comparisons to calculations of the nonlinear response of materials.Undergraduate research students will be trained in the operation of this state-of-the-art femtosecond laser facility. It will also be available as a resource to the members of the Claremont Consortium.

主要研究仪器计划的奖项将使哈维·穆德学院（Harvey Mudd College）获得激光系统，以支持对金属中电子的超快动态以及超大半导体和金属的非线性光学行为的研究。该系统将以1千摩尔茨的重复速率产生飞秒激光束。这将极大地促进泵送测量值，以监视金属中光激发电子的非平衡分布。这些测量值将提供有关金属中能量和动量散射速率的信息，并允许与金属中电子动力学理论进行定量比较。通过连续产生和频率变化，激光系统将允许对薄半导体膜的非线性光学响应进行光谱表征，从而提供有关中心对称半导体中第二谐波产生强度和表面源的有价值的信息。本科生将接受该最先进的飞秒激光设施的运作培训。它也将作为主要研究仪器计划的Claremont财团奖的成员作为资源提供，这将使Harvey Mudd College获得激光系统，以支持对金属中电子和非线性光学行为的超快光学行为的研究研究。金属内部的高密度移动电子导致电子在极快的时间尺度上相互作用。对这些相互作用的详细理解对于理解金属如何催化化学反应以及原子如何吸附金属表面上很重要。新的激光系统将允许哈维·穆德学院（Harvey Mudd College）的研究人员对由于强烈的激光脉冲持续不到五十个飞秒（1 fs = 10-15 s）而导致的金属脉冲对电子系统的变化进行时间分辨的测量。这些测量值将提供有关金属中能量和动量散射速率的信息，并允许与金属中电子动力学理论进行定量比较。激光系统可以提供有关半导体晶体结构和表面质量的有用信息。对谐波响应的光谱研究将提供有关表面和散装现象相对重要性的有用信息，并将允许对材料非线性响应的计算进行详细比较。毕业生研究的学生将接受此最先进的femtsecondsecondsecondsecond Laser设施的培训。它也将作为Claremont财团成员的资源提供。