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Proceedings Paper

Brightness Measurements Of Electron Beams Photoemitted From Multicrystalline LaB[sub]6[/sub] And The Effects Of Environmental Pressure
Author(s): Peter E. Oettinger
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Paper Abstract

Lanthanum hexaboride has been tested as a photoemitter when irradiated by unpolarized UV lasers. For photon energies of 5 eV or less, the material, in a multicrystalline form, is measured to have a quantum efficiency at least an order of magnitude greater than that of simple metals. Maximum currents, from a 1.27 cm2 sample, limited by the available laser power, were recorded to be 52, 36, and 0.9 A at irradiating wavelengths of 193, 248, and 308 nm, respectively. At 193 and 248 nm the corresponding normalized rms brightnesses were 6.7 x 106 and 2.6 x 106 A/cm2-rad2. The results appear insensitive to chamber pressure in, at least, the range of 10-5 to 10-8 toff.

Paper Details

Date Published: 25 July 1989
PDF: 5 pages
Proc. SPIE 1061, Microwave and Particle Beam Sources and Directed Energy Concepts, (25 July 1989); doi: 10.1117/12.951824
Show Author Affiliations
Peter E. Oettinger, Thermo Electron Technologies Corporation (United States)

Published in SPIE Proceedings Vol. 1061:
Microwave and Particle Beam Sources and Directed Energy Concepts
Howard E. Brandt, Editor(s)

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