SMALL-DIVERGENCE ELECTRON-BEAMS PRODUCED BY MULTIPHOTON EXCITATION OF METALLIC SURFACES

被引：5

作者：

MOUSTAIZIS, SD ^{[1
]}

TATARAKIS, M ^{[1
]}

DOUKAS, AG ^{[1
]}

FOTAKIS, C ^{[1
]}

机构：

[1] ARISTOTELIAN UNIV SALONIKA,SCH ENGN,GR-54006 SALONIKA,GREECE

来源：

APPLIED PHYSICS LETTERS | 1991年 / 58卷 / 02期

关键词：

D O I：

10.1063/1.104946

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The angular distribution of photoelectrons produced by laser-induced four-photon excitation in gold metalic targets is reported. Laser-target interaction time effects have been investigated by using two Nd:YAG laser emitting at 1.06-mu-m pulses of 35 ps and 20 ns duration. Both lasers produced four-photon electron angular distributions of 9-degrees +/- 2-degrees full width at half maximum. This width was independent from the intensity of the picosecond laser up to the breakdown threshold at a laser intensity of 1.4 GW/cm2. In contrast, the distribution produced by the nanosecond pulses was broadened at intensity levels higher than 60 MW/cm2, which is indicative of a significant contribution from thermionic emission. These results are compared to those obtained by D. Charalambidis, E. Hontzopoulos, C. Fotakis, Gy. Farkas, and Cs. Toth [J. Appl. Phys. 65, 2843 (1989)], for single photon excitation by using a KrF excimer laser.

引用

页码：194 / 196

页数：3

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