Discharge Pumped Rare-Gas Excimer Lasers in Vacuum Ultraviolet Spectral Region

真空紫外光谱区放电泵浦稀有气体准分子激光器

基本信息

批准号：
04805037
负责人：
SASAKI Wataru
金额：
$ 1.22万
依托单位：
Miyazaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04805037/
关键词：
Rare gas excimer rare gas cluster Vacuum ultraviolet Discharge pumping Xe excimer 希ガスクラスターレーザー真空紫外

项目摘要

Rare gas excimer lasers are atractive vacuum ultraviolet sources with high power tunable output around the center of their spectra. However, their oscillation have been obtained only by electron beam pumping. The electron beam pumped rare gas excimer lasers have difficulties for applications because of their low repitition operation. It, therefore, has been desired the rare gas excimers were considered to produce by three body collisions of an excited rare gas atom with two of ground state atoms. In this case a high pressure operation is favorable, because a formation rate of raer gas excimers is proportional to the square of the gas pressure. It is well known that uniform glow discharges in the high pressure gas are very difficult to establish. We have proposed a new concept of formation of the rare gas excimers in which the rare gas excimers were formed from rare gas clusters in an expanding jet discharge.In this project it has been experimentary confirmed that Xe excimers were forme … More d from the Xe clusters excited by discharge electrons. Distributions of sizes of the Xe clusters were measured with a TOF spectrometer by three photon ionization of the clusters. Densities of the Xe dimers were measured to be 10^<17>cm^<-3> at 3mm down stream of the expanding jet with 3atm.to 8atm.of staggnation pressures. Densities of Xe excimers were measured to be 10^9cm^<-3>, the densities of the clusters were 10^<17>cm^<-3> though. These very low efficiency of excimer formation from the clusters is considered to be unsuitable discharge conditions.In DC sischarges radiative transitions from the ^3SIGMA excimer state were predominant, stimulated emissions, therefore, were not observed because the stimulated emission cross section of ^3SIGMA state was three orders smaller than that of ^1SIGMA state. As a result it is considered that fast pulsed discharges should be essential for obtaining a high laser gain.It is very important to point out that an efficinet vacuum ultraviolet lamp can be produced using the excimer radiation by the ^3SIGMA transitions.In future electron energy dependences of the excitation cross sections of rare gas excimers from the clusters will be measured in order to conclude efficient discharge conditions. Less

罕见的气体原料激光器被吸引的真空紫外线源，其光谱中心周围具有高功率调谐输出。但是，它们的振荡仅通过电子束泵送才能获得。电子束泵送稀有气体准分子激光器由于其低重分操作而难以应用。因此，人们一直在考虑稀有的气体预兆通过带有两个基态原子的令人兴奋的稀有气体原子的三个身体碰撞产生。在这种情况下，高压操作是有利的，因为RAER气体进料器的形成速率与气压平方成正比。众所周知，在高压气体中均匀的发光排放非常困难。我们提出了一个新的概念，即形成稀有的气体进取剂，其中稀有的气体排斥剂是由稀有气体簇在扩展的喷射放电中形成的。在该项目中，实验证实，XE XE准分子是由排放电子激发的XE群集的形成。 XE簇的大小的分布通过簇的三个光子电离测量。测量Xe二聚体的密度为10^<17> cm^<-3>在3毫米向下延伸喷气流的3mm下方，用3atm.to 8atm. 8atm.of停滞压力。测量Xe准分子的密度为10^9cm^<-3>，簇的密度为10^<17> cm^<-3>。这些从集群中形成的准分子形成非常低的效率被认为是不合适的放电条件。在DC Sischuse中，从 ^3sigma compimer态的辐射过渡是主要的，因此未观察到刺激的排放，因为 ^3sigma状态的刺激发射截面是 ^3sigma状态的刺激横截面，这是 ^3sigma状态小于 ^1sigmma sysigma sysigma的三个阶。结果，认为快速脉冲放电对于获得高激光器的增益至关重要。指出，可以使用 ^3sigma Transitions的Eximer辐射来产生有效的真空吸尘器紫外线灯。未来的电子能量依赖性的Equimer辐射。从未来的电子能量依赖群体的稀有气体进料器的令人兴奋的群体偏见的群体依赖性将均应衡量列出的情况下，以包括有效的条件。较少的