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Proceedings Paper

GaAsP photocathode with 40% QE at 550 nm
Author(s): John P. Edgecumbe; Verle W. Aebi; Gary A. Davis
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Paper Abstract

We have fabricated 18mm format vacuum photodiodes incorporating GaAsP/A1GaAsP photocathodes (Eg 8eV) with P-20 phosphor screens. The photocathode response peaks at approximately 550nm. The quantum efficiency at 550nm is in excess of 55 (electrons per incident photon). The photocathode dark current for these tubes is less than i014 Amps/cm2 at room temperature. We have compared this cathode with the GaAs/AlGaAs photocathode.

Paper Details

Date Published: 1 June 1992
PDF: 7 pages
Proc. SPIE 1655, Electron Tubes and Image Intensifiers, (1 June 1992); doi: 10.1117/12.60336
Show Author Affiliations
John P. Edgecumbe, Intevac, Inc. (United States)
Verle W. Aebi, Intevac, Inc. (United States)
Gary A. Davis, Intevac, Inc. (United States)


Published in SPIE Proceedings Vol. 1655:
Electron Tubes and Image Intensifiers
C. Bruce Johnson; Bruce N. Laprade, Editor(s)

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