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Soft X-ray Laser by Hybrid Excitation Method Using Laser Produced Multiple Charged Ions

使用激光产生多带电离子的混合激发方法的软 X 射线激光器

基本信息

批准号：
08650054
负责人：
KUBODERA Shoichi
金额：
$ 1.15万
依托单位：
Miyazaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650054/
关键词：
High Intensity Laser Ultrashort Pulse Laser Soft X-ray Laser Multiple Charged Ion Rare Gas Excimer Vacuum Ultraviolet Laser レーザー生成多価イオン軟X線電子ビーム発生装置放電励起

项目摘要

I have proposed a hybrid excitation method as a new method to realize a soft x-ray laser where high intensity laser produced multiple charged ions are further excited by electrical power from a compact discharge device.As a result of the interaction of Ar and high intensity laser field, I have observed emission from Ar_2^<**> at 126 nm for the first time together with some signals of high order harmonics. The focused laser intensity dependence of the Ar excimer intensity agrees well with that predicted by a tunnel ionization theory so called ADK theory. I,therefore, found out that the production of Ar excimers was initiated by high intensity laser produced electrons, which may become a substitution to those produced by an electron beam device.It is well known that the electron temperature as a result of tunnel ionization is very sensitive to laser intensity, wavelength, and polarization. Experimental data, however, show no difference in terms of the Ar excimer emission when linearly po … More larized and circularly polarized laser beams interacted with Ar. Considering about the energy transport of electrons in a high intensity laser produced plasma theoretically, I have found out a rapid conductive cooling of a plasma plays an important role for the excimer production. A cooling time constant for the appropriate excimer production is much faster than the three body recombination time constant which is a main production process of the excimers.In order to simulate an interaction between x-ray emission from a discharge plasma and rare gas (Kr), an x-ray source using laser produced plasma was used as a compact x-ray source. When Kr atoms were excited by soft x-ray emission from a laser produced plasma, Kr excimer emission centered at 147 nm was observed as well as emission from Kr^<2+> at 157nm.Time resolved data of these emissions show both rise times as fast as that of a plasma initiating laser, indicating the direct ion/excimer production by soft x-ray emission from a plasma. This may be advantageous because the excimer production is not much affected by an electron deexcitation process. Based on a photoionization model, the Kr^<2+> ions are produced by photoionization of Kr 4p electrons. This ion production initiates the excimer production kinetics by ionic channels. Less

本文提出了一种新的实现软X射线激光的方法--混合激发法，即用一个小型放电装置的电源进一步激发高强度激光产生的多个带电离子，通过Ar与强激光场的相互作用，首次观察到Ar_2 ~** 在126 nm处的发射和一些高次谐波信号。聚焦激光强度的Ar准分子强度的依赖性同意很好的隧道电离理论，即所谓的ADK理论预测。因此，我发现Ar准分子的产生是由高强度激光产生的电子引发的，这可能成为电子束装置产生的电子的替代品。然而，实验数据表明，当线性地改变Ar激基发射时， ...更多信息偏振和圆偏振的激光束与Ar相互作用。从理论上考虑了电子在强激光等离子体中的能量输运，发现等离子体的快速传导冷却对准分子的产生起着重要的作用。为了模拟放电等离子体与稀有气体（Kr）的相互作用，采用激光等离子体X射线源作为紧凑型X射线源。用激光等离子体产生的软X射线激发Kr原子，观测到Kr原子的准分子发射和Kr^<2+>原子的准分子发射，前者的发射中心波长为147 nm，后者的发射中心波长为157 nm，时间分辨数据表明，这两种发射的上升时间与等离子体激发激光的上升时间一样快，表明等离子体的软X射线直接产生了离子/准分子。这可能是有利的，因为受激准分子产生不受电子去激过程的太大影响。基于光电离模型，Kr^<2+>离子是通过Kr 4p电子的光电离产生的。该离子产生通过离子通道启动受激准分子产生动力学。少