Electric lamp and discharge devices – Photosensitive – Photocathode
Patent
1995-07-10
1997-11-04
Patel, Nimeshkumar
Electric lamp and discharge devices
Photosensitive
Photocathode
313530, 313541, 313539, 313544, H01J 4006
Patent
active
056843607
ABSTRACT:
An electron source includes a negative electron affinity photocathode on a light-transmissive substrate and a light beam generator for directing a light beam through the substrate at the photocathode for exciting electrons into the conduction band. The photocathode has at least one active area for emission of electrons with dimensions of less than about two micrometers. The electron source further includes electron optics for forming the electrons into an electron beam and a vacuum enclosure for maintaining the photocathode at high vacuum. In one embodiment, the active emission area of the photocathode is defined by the light beam that is incident on the photocathode. In another embodiment, the active emission area of the photocathode is predefined by surface modification of the photocathode. The source provides very high brightness from an ultra-small active emission area of the photocathode.
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Colin A. Stanford, Doctoral Thesis, Cornell University Dept. of Electrical Engineering May (1990), Entitled: Laser Pulsed GaAs Negative Electron Affinity Photocathodes for Electron Beam Instrumentation.
Baum Aaron Wolf
Costello Kenneth A.
Board of Trustees of the Leland Stanford Jr. University
Cole Stanley Z.
Intevac, Inc.
McClellan William R.
Patel Nimeshkumar
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