Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1999-02-25
2000-12-05
Henry, Jon
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 3, 365117, 365125, 365216, 430 1, 430 2, G03H 102, G03H 104, G11C 1122
Patent
active
061574708
ABSTRACT:
A non-volatile holographic recording method and system based on a doubly-doped photorefractive material. One embodiment of the holographic material is doped to have first and second types of dopants that are operable to produce charge carriers to a common band in response to radiation of a specified wavelengths. Charge carriers in the common band can migrate to a different spatial location. The dopants are also capable of recombining with charge carriers in the common band. The first type of dopants have a first dopant energy level below the band by a first energy gap greater than a second energy gap of a second dopant energy level of the second type of dopants below the common band. The first and second dopant energy levels are separated from each other so that their absorption bands to the common band are substantially separated. In addition, the first and second energy gaps should be much greater than the thermal energy k.sub.B T associated with the operating temperature T in order to substantially reduce or minimize the probability of thermal excitation of charge carriers.
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Adibi Ali
Buse Karsten
Psaltis Demetri
California Institute of Technology
Henry Jon
LandOfFree
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