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公开(公告)号：WO1986003853A1
公开(公告)日：1986-07-03
申请号：PCT/US1985002144
申请日：1985-10-30
Applicant: HUGHES AIRCRAFT COMPANY
Inventor： HUGHES AIRCRAFT COMPANY , CHERN, Mao-Jin , WREEDE, John, E.
IPC: G03H01/18
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: A holographic recording medium is treated to reduce or eliminate unwanted extraneous diffraction and flare. Regions adjacent surfaces of the medium are desensitized to reduce contrast in the holographic fringe pattern along the surfaces, thereby eliminating planar phase grating effects. Treatments include applying a burst of gas or vapor to the surfaces of the medium, irradiating the surfaces with highly absorbed incoherent light, thermally treating the medium as it is built up from sequentially applied layers, building up layers of different concentrations of light-sensitive material, and developing diffusion regions at interfaces of layers within the holographic recording medium.
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公开(公告)号：WO1986005286A1
公开(公告)日：1986-09-12
申请号：PCT/US1986000043
申请日：1986-01-13
Applicant: HUGHES AIRCRAFT COMPANY
Inventor： HUGHES AIRCRAFT COMPANY , WREEDE, John, E.
IPC: G03H01/18
CPC classification number: G11B7/0065 , G03C1/66 , G03H1/18 , Y10S359/90
Abstract: Light sensitive recording medium is exposed to highly absorbed incoherent light either before or after a slant fringe hologram is recorded therein to reduce the sensitivity of the medium at surface regions adjacent a supporting substrate. The fringes recorded in the area of reduced sensitivity have lower contrast than those recorded in the remainder of the medium, freeing the fringes from the substrate and allowing greater expansion of the medium during a subsequent chemical swelling process. The increased swelling amplifies the refractive index modulation in the medium to increase the diffraction efficiency of the hologram. Dye may be added to the medium to increase absorbance of the incoherent light.
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公开(公告)号：WO1986003852A1
公开(公告)日：1986-07-03
申请号：PCT/US1985002139
申请日：1985-10-30
Applicant: HUGHES AIRCRAFT COMPANY
Inventor： HUGHES AIRCRAFT COMPANY , WREEDE, John, E. , ARNS, James, A.
IPC: G03H01/18
CPC classification number: G11B7/0065 , G03C1/66 , G03H1/18
Abstract: A holographic recording medium is treated to eliminate side lobes. The method involves exposing opposed surfaces of the medium with filtered incoherent light either before or after a holographic exposure with coherent light. The incoherent exposure produces controlled desensitization of the medium, resulting in a sensitivity profile which increases continuously to a maximum near the center of the layer. A hologram recorded in the layer has a refractive index modulation which is high in the center of the layer and which decreases toward the surfaces of the layer.
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公开(公告)号：WO1986005285A1
公开(公告)日：1986-09-12
申请号：PCT/US1986000042
申请日：1986-01-13
Applicant: HUGHES AIRCRAFT COMPANY
Inventor： HUGHES AIRCRAFT COMPANY , WREEDE, John, E.
IPC: G03H01/18
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: A layer of material having relatively low light sensitivity is interposed between a substrate and a light sensitive recording medium during recording of a slant fringe hologram. The layer frees the ends of the fringes from the substrate to permit greater expansion during a subsequent chemical swelling process, thereby resulting in a slant fringe hologram having improved efficiency. In one embodiment, a separate layer of light insensitive material is applied to the substrate prior to application of the recording medium. In another embodiment, a separate layer of light sensitive material is applied to the substrate and is then desensitized by exposure to incoherent light or by heat treatment prior to application of the recording medium.
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公开(公告)号：EP0214226B1
公开(公告)日：1991-10-16
申请号：EP86901573.5
申请日：1986-01-13
Applicant: Hughes Aircraft Company
Inventor： WREEDE, John, E.
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: A layer of material having relatively low light sensitivity is interposed between a substrate and a light sensitive recording medium during recording of a slant fringe hologram. The layer frees the ends of the fringes from the substrate to permit greater expansion during a subsequent chemical swelling process, thereby resulting in a slant fringe hologram having improved efficiency. In one embodiment, a separate layer of light insensitive material is applied to the substrate prior to application of the recording medium. In another embodiment, a separate layer of light sensitive material is applied to the substrate and is then desensitized by exposure to incoherent light or by heat treatment prior to application of the recording medium.
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Patent Agency Ranking
公开(公告)号：EP0215839A1
公开(公告)日：1987-04-01
申请号：EP86901574.0
申请日：1986-01-13
Applicant: Hughes Aircraft Company
Inventor： WREEDE, John, E.
CPC classification number: G11B7/0065 , G03C1/66 , G03H1/18 , Y10S359/90
Abstract: Un support photosensible d'enregistrement est exposé à une lumière incohérente à absorption élevée soit avant soit après l'enregistrement sur le support d'un hologramme à franges obliques, afin de réduire la sensibilité du support dans des régions de la surface adjacentes à un substrat de support. Les franges enregistrées dans la zone de sensibilité réduite présentent un contraste réduit par rapport à celles enregistrées dans le reste du support, ce qui libère les franges du substrat et permet une plus grande dilatation du support pendant un processus chimique successif de gonflement. L'accroissement du gonflement amplifie la modulation de l'indice de réfraction dans le support pour augmenter l'efficacité de diffraction de l'hologramme. Un colorant peut être ajouté au support pour accroître l'absorption de la lumière incohérente.
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公开(公告)号：EP0207992B1
公开(公告)日：1989-09-13
申请号：EP86901287.2
申请日：1985-10-30
Applicant: Hughes Aircraft Company
Inventor： CHERN, Mao-Jin , WREEDE, John, E.
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: A holographic recording medium is treated to reduce or eliminate unwanted extraneous diffraction and flare. Regions adjacent surfaces of the medium are desensitized to reduce contrast in the holographic fringe pattern along the surfaces, thereby eliminating planar phase grating effects. Treatments include applying a burst of gas or vapor to the surfaces of the medium, irradiating the surfaces with highly absorbed incoherent light, thermally treating the medium as it is built up from sequentially applied layers, building up layers of different concentrations of light-sensitive material, and developing diffusion regions at interfaces of layers within the holographic recording medium.
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公开(公告)号：EP0214226A1
公开(公告)日：1987-03-18
申请号：EP86901573.0
申请日：1986-01-13
Applicant: Hughes Aircraft Company
Inventor： WREEDE, John, E.
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: Une couche d'un matériau possédant une photosensibilité relativement faible est intercalée entre un substrat et un support photosensible d'enregistrement pendant l'enregistrement d'un hologramme à franges obliques. La couche libère du substrat les extrémités des franges pour permettre une plus grande dilatation pendant un procédé chimique successif de gonflement, ce qui permet d'obtenir un hologramme à franges obliques à efficacité améliorée. Dans un mode de réalisation, une couche séparée de matériau insensible à la lumière est appliquée sur le substrat avant l'application du support d'enregistrement. Dans une variante, une couche séparée de matériau photosensible est appliquée sur le substrat et désensibilisée en l'exposant à une lumière incohérente ou en la soumettant à un traitement thermique avant l'application du support d'enregistrement.
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公开(公告)号：EP0207992A1
公开(公告)日：1987-01-14
申请号：EP86901287.0
申请日：1985-10-30
Applicant: Hughes Aircraft Company
Inventor： CHERN, Mao-Jin , WREEDE, John, E.
CPC classification number: G03H1/18 , G03C1/66 , Y10S359/90
Abstract: Un support d'enregistrement holographique est traité afin de réduire ou d'éliminer la diffraction et les taches lumineuses étrangères et indésirables. Les régions adjacentes aux surfaces du support sont désensibilisées afin de réduire les contrastes dans la configuration holographique des franges le long des surfaces, en éliminant ainsi des effets de quadrillage de la phase planaire. Les traitements utilisés comprennent l'application d'une rafale de gaz ou de vapeur sur les surfaces du support, l'irradiation des surfaces par de la lumière incohérente très absorbée, le traitement thermique du support à mesure que celui-ci est formé par des couches successivement appliquées, la formation de couches ayant des concentrations diverses de matériau photosensible, et le développement de zones de diffusion aux interfaces entre les couches, dans le support d'enregistrement holographique.
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公开(公告)号：EP0215839B1
公开(公告)日：1994-05-18
申请号：EP86901574.3
申请日：1986-01-13
Applicant: Hughes Aircraft Company
Inventor： WREEDE, John, E.
CPC classification number: G11B7/0065 , G03C1/66 , G03H1/18 , Y10S359/90
Abstract: Light sensitive recording medium is exposed to highly absorbed incoherent light either before or after a slant fringe hologram is recorded therein to reduce the sensitivity of the medium at surface regions adjacent a supporting substrate. The fringes recorded in the area of reduced sensitivity have lower contrast than those recorded in the remainder of the medium, freeing the fringes from the substrate and allowing greater expansion of the medium during a subsequent chemical swelling process. The increased swelling amplifies the refractive index modulation in the medium to increase the diffraction efficiency of the hologram. Dye may be added to the medium to increase absorbance of the incoherent light.
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