Electric lamp and discharge devices – Photosensitive – Photocathode
Reexamination Certificate
2005-01-25
2005-01-25
Williams, Joseph (Department: 2879)
Electric lamp and discharge devices
Photosensitive
Photocathode
C313S530000, C313S541000, C250S2140VT, C250S492200
Reexamination Certificate
active
06847164
ABSTRACT:
An electron beam source has a photocathode with a photoemitter material having a work function, and with a beam receiving portion and an electron emitting portion. A first light source directs a first light beam onto the beam receiving portion of the photocathode to generate an electron beam from the electron emitting portion. The first light beam has a wavelength λ1such that hc/λ1is at least about the work function of the photoemitter material, where ‘h’ is Planck's constant and ‘c’ is the speed of light. A second light source directs a second light beam onto the beam receiving portion of the photocathode, such as onto the beam receiving portion, to stabilize the electron beam. The second light beam having a wavelength λ2such that hc/λ2is less than about the work function of the photoemitter material.
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Coyle Steven
Janaway Gordon
Applied Matrials, Inc.
Ashok Janah
Quarterman Kevin
Williams Joseph
LandOfFree
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