Characteristic improvement of tungsten photocathode by two-wavelength irradiation of the Nd:YAG laser

被引：2
|
作者：
Ohkubo, K
Nakao, N
Mima, K
Nakai, S
Fujita, M
Imasaki, K
Yamanaka, C
Watanabe, T
Ishida, T
Ohigashi, N
Tsunawaki, Y
机构：
[1] INST LASER TECHNOL,SUITA,OSAKA 565,JAPAN
[2] KANSAI UNIV,SUITA,OSAKA 564,JAPAN
[3] OSAKA SANGYO UNIV,DAITO,OSAKA 574,JAPAN
来源：
APPLIED PHYSICS LETTERS | 1997年 / 70卷 / 17期
关键词：
D O I：
10.1063/1.118846
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Metals or metal compounds as photocathodes provide high current density and have a high damage threshold for laser irradiation. In addition, the quantum efficiency of these cathodes is enhanced by heating to a higher operating temperature. The tungsten photocathode heated up to 1400 K and irradiated by 2 omega (532 nm) of the Nd:YAG laser produced an electron beam with high current density (similar to 1 kA/cm(2)) and the quantum efficiency was about 10(-5). The fundamental (1064 nm) of a Nd:YAG laser was used to further heat up the cathode instantly; the temperature rise was calculated to be 2000 K in a 10 ps time scale. Compared to the static 1400 K operation, two times enhancement of quantum efficiency was observed. (C) 1997 American Institute of Physics.
引用
收藏
页码：2312 / 2314
页数：3
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