Patent EP0324496A2 successfully refreshed from Google Patents.
EP0324496A2
Expired / Lapsed
EP
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Method of producing holograms particularly for holographic helmet displays
Assignee: Yeda Research and Development Co Ltd
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Filing: 1989-01-13
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Granted: —
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Expires: 2009-01-13
Abstract
Abstract A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, characterized in that one or both of the recording beams have an aspherical wavefront derived from one or more intermediate holograms each reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams for recording the respective intermediate hologram.
Inventors
- 👤 Asher Albert Friesem
- 👤 Yaakov Amitai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 19:00
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G02B27/00; G02B27/01; G02B27/0101; G02B27/0103; G02B27/017; G02B27/0172; G03; G03H; G03H1/00; G03H1/04; G02B2027/0105; G02B2027/0107; G02B2027/0109; G02B2027/0145
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, characterized in that at least one of the recording beams has an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams for recording the respective intermediate hologram.
Claim 2
Independent Claim
87 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, characterized in that at least one of the recording beams has an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams for recording the respective intermediate hologram.
Claim 3
Dependent Claim
34 words
The method according to Claim 1, wherein both of said recording beams utilized to produce the interference pattern which is recorded to form the desired hologram have aspherical wavefronts derived from said intermediate hologram.
Claim 4
Dependent Claim
23 words
The method according to Claim 1, wherein said recording beam having an aspherical wavefront is derived from but one of said intermediate holograms.
Claim 5
Dependent Claim
117 words
The method according to Claim 1, wherein said recording beam having an aspherical wavefront is derived form a plurality of intermediate holograms recorded sequentially; the first intermediate hologram being prepared by recording the interference pattern between two recording beams each of a simple wavefront having a predetermined geometry and/or wavelength and read out with a read out beam of a simple wavefront having a geometry and/or wavelength different from both said latter recording beams to produce an output beam having a wavefront of a predetermined asphericity; each subsequent intermediate hologram being prepared by using, as one of its recording beams, the output beam of the immediately preceding intermediate hologram to produce an output beam of different asphericity.
Claim 6
Independent Claim
84 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, wherein only one of the recording beams has an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams for recording the respective intermediate hologram.
Claim 7
Independent Claim
84 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, wherein only one of the recording beams has an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams for recording the respective intermediate hologram.
Claim 8
Dependent Claim
24 words
A method according to Claim 5, wherein said one recording beam having an aspherical wavefront is derived from but one of said intermediate holograms.
Claim 9
Dependent Claim
118 words
The method according to Claim 5, wherein said one recording beam having an aspherical wavefront is derived from a plurality of intermediate holograms recorded sequentially; the first intermediate hologram being prepared by recording the interference pattern between two recording beams each of a simple wavefront having a predetermined geometry and/or wavelength and read out with a read out beam of a simple wavefront having a geometry and/or wavelength different from both said latter recording beams to produce an output beam having a wavefront of a predetermined asphericity; each subsequent intermediate hologram being prepared by using, as one of its recording beams, the output beam of the immediately preceding intermediate hologram to produce an output beam of different asphericity.
Claim 10
Independent Claim
81 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, both of said recording beams having an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams recording the respective intermediate hologram.
Claim 11
Independent Claim
81 words
A method of producing a desired hologram for a holographic optical element for use in imaging a multi-dimensional array of points, in which two coherent recording beams are utilized to produce an interference pattern which is recorded to form the desired hologram, both of said recording beams having an aspherical wavefront derived from at least one intermediate hologram reconstructed by the use of a read out beam having a geometry and/or wavelength different from the beams recording the respective intermediate hologram.
Claim 12
Dependent Claim
25 words
The method according to Claim 8, wherein each of said recording beams having an aspherical wavefront is derived from but one of said intermediate holograms.
Claim 13
Dependent Claim
119 words
The method according to Claim 8, wherein each of said recording beams having an aspherical wavefront is derived from a plurality of intermediate holograms recorded sequentially; the first intermediate hologram being prepared by recording the interference pattern between two recording beams each of a simple wavefront having a predetermined geometry and/or wavelength and read out with a read out beam of a simple wavefront having a geometry and/or wavelength different from both said latter recording beams to produce an output beam having a wavefront of a predetermined asphericity; each subsequent intermediate hologram being prepared by using, as one of its recording beams, the output beam of the immediately preceding intermediate hologram to produce an output beam of different asphericity.
References Cited (Backward Citations)
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