Simple laser-driven, metal-photocathode electron source

Downey, S. W.; Builta, L. A.; Moir, D. C.; Ringler, T. J.; Saunders, J. D.
October 1986
Applied Physics Letters;10/13/1986, Vol. 49 Issue 15, p911
Academic Journal
An ArF excimer laser was used to produce photoelectrons from common metal surfaces at modest vacuum. The photoelectrons are subsequently accelerated across an anode-cathode gap. Both space-charge and emission-limited flow were examined. The temporal characteristics of the emission-limited electron beam produced by this device are nearly identical to those of the laser pulse used to produce the photoemission. In the space-charge-limited case, a rise time of 3 ns was obtained. Maximum current densities of 70 A/cm2 were achieved.


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