Photoemission studies on metals using picosecond ultraviolet laser pulses
作者:
T. Srinivasan‐Rao,
J. Fischer,
T. Tsang,
期刊:
Journal of Applied Physics
(AIP Available online 1991)
卷期:
Volume 69,
issue 5
页码: 3291-3296
ISSN:0021-8979
年代: 1991
DOI:10.1063/1.348550
出版商: AIP
数据来源: AIP
摘要:
We report the quantum efficiency of various metals irradiated by 266‐nm, 4.66‐eV laser pulses of 10‐ps duration. The highest quantum efficiency obtained is 7.25×10−4with samarium photocathodes. Current densities exceeding 66 and 21 kA/cm2have been obtained from an area of 0.05 and 7 mm2, respectively. The maximum currents and current densities obtainable in these experiments are limited by the space charge. For surface fields exceeding 5×107V/m on gold, the efficiency increases linearly with the field for the values investigated. Based on the quantum efficiency and optical damage threshold measurements, current densities exceeding 100 kA/cm2seem feasible without damaging the photocathode.
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