Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1987-07-10
1989-02-21
Sikes, William L.
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
372 24, 372 40, 372 74, H01S 3091
Patent
active
048072419
ABSTRACT:
The luminescent screen of a cathode ray tube includes an array of monocrystalline or amorphous phosphor rod-like elements which are covered with a reflective coating except for one end of each element which serves as an output face. The phenomenon of the light trapping is advantageously exploited to achieve enhanced brightness. The screen is illuminated with an electron beam which has an essentially oblong cross section and which is oriented along the elongated dimension of the elements. In one embodiment the elements comprise epitaxial Lu.sub.3 Al.sub.3 Ga.sub.2 O.sub.12 :Ce on the top of a YAG substrate, and a light absorbing layer of Lu.sub.3 Al.sub.3.5 Fe.sub.1.5 O.sub.12 is formed on the bottom of the substrate. A printer utilizing such a CRT is described. Also described is a configuration in which each of the rod-like elements functions as a laser.
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Berkstresser George W.
Shmulovich Joseph
American Telephone and Telegraph Company AT&T Bell Laboratories
Sikes William L.
Urbano Michael J.
Vo Xuan T.
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