Real-time observation and control of the high-harmonics generation and coulomb explosion of metal clusters in intense laser fields

强激光场中金属团簇高次谐波产生和库仑爆炸的实时观测与控制

基本信息

批准号：
11640383
负责人：
OHMORI Kenji
金额：
$ 2.24万
依托单位：
Tohoku Univesity
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

This research has been carried out in order to reveal the wave-packet dynamics associated with the multiple ionization and high harmonics generation of clusters in intense laser fields and to control those processes based on the quantum optical philosophy. First we succeeded in observing the wave-packet motion on the excited-state surface of the metal-rare gas or the metal-diatomic molecule clusters. The observed wave-packet motion has given the shape of the excited-state surface. We have examined the possibility of controlling the relevant wave-packet motion and found that a phase-locked optical-pulse pair is effective for that purpose. We have successfully carried out this scenario by controlling the interference of two nuclear wave packets generated in a single cluster with an accuracy of attoseconds. Next we constructed the electron time of flight detector (e-TOF) aiming at observing the electrons and ions that are ejected when the relevant wave packet is exposed to petawatt laser fields. We have measured the photoelectron spectra of atoms and molecules put in the petawatt laser fields using that e-TOF and found for the first time a high-energy component around 200 eV in addition to the low-energy valence component below 50 eV observed by many groups so far. This high-energy electron ejection is expected to be a counterpart of the high-harmonics generation in the soft X-ray region. At the moment we are trying to control this high-energy electron ejection through the phase modulation of the petawatt laser pulse. This technique is expected to realize the attosecond soft X-ray pulse source in the near future.

这项研究是为了揭示与强烈激光场中多重电离和高谐波产生簇相关的波包动力学，并基于量子光学哲学来控制这些过程。首先，我们成功地观察了金属稀有气体或金属 - 局部分子分子簇的激发状态表面上的波包运动。观察到的波包运动给出了激发态表面的形状。我们已经检查了控制相关的波动运动运动的可能性，并发现一对相锁的光脉冲对对此目的有效。我们通过控制一个具有attoseconds精确度的单个群集中产生的两个核波包的干扰，成功地进行了这种情况。接下来，我们构建了飞行探测器（E-TOF）的电子时间，目的是观察相关波数据包暴露于Petawatt激光场时弹出的电子和离子。我们已经测量了使用该E-TOF放入Petawatt激光场的原子和分子的光电子光谱，并首次发现了200 ev的高能量分量，除了许多低于50 eV的低能价分量，许多人都观察到了许多人。到目前为止。预计这种高能电子弹出物将是软X射线区域中高甲基产物的对应物。目前，我们试图通过Petawatt激光脉冲的相位调制来控制这种高能电子弹射。预计该技术将在不久的将来实现Attosent Soft X射线脉冲源。