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Optical Engineering

High current density small divergence electron beam production by laser-induced various-order multiphoton photoeffect
Author(s): Gyozo Farkas; Csaba Toth
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Paper Abstract

The relative roles of (1) surface and volume type photoelectric effects, (2) slow and fast laser-induced thermionic electron emission, and (3) optical tunnel emission are discussed from the point of view of the production possibilities of efficient high current density, small divergency electron beams. Angular distribution of photoelectrons emitted from gold target surface by high-intensity pulsed laser radiation at wavelengths of 1060, 343, and 248 nm for the s and p polarization of the grazing incident radiation are investigated experimentally. For the longer wavelengths, where the order of the multiphoton photoelectric emission increases, the ratio of the yields of the surface photoeffect and of the volume photoeffect also increases. The comparative advantages of the surface multiphoton photoeffect of metals as a promising method for the realization of small emittance, high brightness, high current density electron sources are pointed out.

Paper Details

Date Published: 1 October 1993
PDF: 7 pages
Opt. Eng. 32(10) doi: 10.1117/12.145285
Published in: Optical Engineering Volume 32, Issue 10
Show Author Affiliations
Gyozo Farkas, Research Institute for Solid-State Physics (Hungary)
Csaba Toth, Univ. of California/San Diego (United States)

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