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SI(Ag-O-Cs)光电阴极是第一种实用的光电阴极,尽管它的发射机理尚未完全清楚。这种半透明光电阴极又是唯一可以用来研究持续时间短于10Ps的1.06μm钕激光脉冲的阴极。近些年来在这个波长下的应用和在制造稳定、灵敏的SI光电阴极中所遇到的困难,导致了新的研究工作,其目标是对这种光电阴极结构更加深入的了解。我们首先对巴黎天文台最近获得的一些实验结果(电原子能委员会发起的研究工作)和关于四年前制作的一些1μm波长范围光电阴极寿命的报告做一评述。在第二部分,我们试图对最近十年来在几个不同的实验室中所做的研究工作,做一些分析,这些工作包括确定SI光电阴极中一些主要成份的作用(Ag粒子,Cs氧化物)及其对光电发射的贡献,以致力于改进SI光电阴极的灵敏度和稳定性。
The SI (Ag-O-Cs) photocathode is the first practical photocathode although its emission mechanism is not fully understood. This translucent photocathode is the only cathode that can be used to study 1.06μm neodymium laser pulses lasting less than 10μs. The application of this wavelength in recent years and the difficulties encountered in the manufacture of stable and sensitive SI photocathodes have led to new research efforts aimed at gaining a deeper understanding of such photocathode structures. We first comment on some of the recent experimental results obtained by the Paris Observatory (the work initiated by the Commission on Electronomic Energy) and some reports on the lifetime of photocathodes in the 1 μm wavelength range made four years ago. In the second part, we try to do some analysis on the research work carried out in several different laboratories in the last ten years. These work include the determination of the role of some major components in the SI photocathode (Ag particles, Cs oxide) And its contribution to photoemission, with a view to improving the sensitivity and stability of the SI photocathode.