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Photoemission studies on metals using picosecond ultraviolet laser pulses (1991)

Srinivasan-Rao, T. ; Fischer, J. ; Tsang, T.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 69 (1991), S. 3291-3296

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: 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 7.25×10−4 with samarium photocathodes. Current densities exceeding 66 and 21 kA/cm2 have 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 5×107 V/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/cm2 seem feasible without damaging the photocathode.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.348550

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