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Proceedings Paper

Imaging GaAs vacuum photodiode with 40% quantum efficiency at 530 nm
Author(s): Kenneth A. Costello; Verle W. Aebi; Hugh MacMillan
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Paper Abstract

This paper will describe a high quantum efficiency imaging phosphor diode optimized for 500-700 nm sensitivity. Potential applications for this tube include undersea imaging and detection of 530-nm laser light. The tube is designed to function as a low noise factor optical amplifier. The tube consists of an 18-mm CsO activated GaAs/AlGaAs photocathode and a high resolution P46 phosphor screen enclosed in a Kovar/ceramic vacuum envelope. Measured results for quantum efficiency (QE), MTF, dark current, noise factor, operating life, response time and gain are presented. Finally, the paper discusses the engineering tradeoffs associated with fabricating a GaAs/AlGaAs cathode with high short wavelength QE.

Paper Details

Date Published: 1 July 1990
PDF: 8 pages
Proc. SPIE 1243, Electron Image Tubes and Image Intensifiers, (1 July 1990); doi: 10.1117/12.19469
Show Author Affiliations
Kenneth A. Costello, Varian Associates, Inc. (United States)
Verle W. Aebi, Varian Associates, Inc. (United States)
Hugh MacMillan, Varian Associates, Inc. (United States)


Published in SPIE Proceedings Vol. 1243:
Electron Image Tubes and Image Intensifiers
Illes P. Csorba, Editor(s)

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