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US5682255A
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Holographic optical devices for the transmission of optical signals of a plurality of channels
Assignee: Yeda Research and Development Co Ltd
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Filing: 1994-02-23
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Granted: 1997-10-28
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Expires: 2014-02-23
Abstract
Abstract A holographic optical device includes a light-transmissive substrate, a first holographic optical element, and a second holographic optical element that is laterally disposed on the substrate from the first holographic optical element. At least one of the holographic optical elements is a complex diffraction grating that can handle a multiplicity of plane and/or spherical waves arriving from a range of angles, and having a range of wavelengths. Applications for the device include a wavelength division multiplexer/demultiplexer, an image reconstructor, a beam expander/compressor, and a visor/head-up display.
Inventors
- 👤 Asher Albert Friesem
- 👤 Yaakov Amitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:11
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/12007; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02B5/32; G02B6/24; G02B6/26; G02B6/28; G02B6/2804; G02B6/2848; G02B6/293; G02B6/29304; G02B6/29316; G02B6/29323; G02B6/29325; G02B6/29379; G02B6/2938; G03; G03H; G03H1/00; G03H1/22; G02B6/29328; G02B6/29329; G02B6/29371; G02B6/29373; G02B6/42; G02B6/43; G03H1/04; G03H1/0402; G03H1/0408
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A holographic optical device, for the transmission of optical signals of a plurality of channels each of a different wavelength between (a) a plurality of optical transmission paths, one for each channel, and (b) a single optical transmission path for all the channels, comprising: a light-transmissive substrate; a first holographic optical element carried by said substrate; and at least two further holographic optical elements carried by said substrate laterally of said first holographic optical element; characterized in that: at least one of said holographic optical elements is diffraction grating that can handle a multiplicity of plane waves and/or spherical waves having a range of wavelengths; and said holographic optical elements include a single hologram associated with said single optical transmission path and having a plurality of optical elements, one for each of said channels and a plurality of holograms, each aligned with one of said plurality of optical transmission paths, and having a single hologram optical element for the channel of the respective path.
Claim 2
Dependent Claim
164 words
A holographic optical device, for the transmission of optical signals of a plurality of channels each of a different wavelength between (a) a plurality of optical transmission paths, one for each channel, and (b) a single optical transmission path for all the channels, comprising: a light-transmissive substrate; a first holographic optical element carried by said substrate; and at least two further holographic optical elements carried by said substrate laterally of said first holographic optical element; characterized in that: at least one of said holographic optical elements is diffraction grating that can handle a multiplicity of plane waves and/or spherical waves having a range of wavelengths; and said holographic optical elements include a single hologram associated with said single optical transmission path and having a plurality of optical elements, one for each of said channels and a plurality of holograms, each aligned with one of said plurality of optical transmission paths, and having a single hologram optical element for the channel of the respective path.
Claim 3
Dependent Claim
119 words
The device according to claim 1, wherein said device is a demultiplexer for demultiplexing the optical signals transmitted from the single optical transmission path to the plurality of optical transmission paths; said single hologram of the holographic device being aligned with said single optical transmission path, and its plurality of holographic optical elements being effective to collimate the light of the plurality of channels and to diffract said light in a different direction for each channel; each of said plurality of holograms of the holographic device being aligned with one of said plurality of optical transmission paths, and its holographic optical element being effective to focus the collimated light of the respective channel onto its respective optical transmission path.
Claim 4
Dependent Claim
116 words
The device according to claim 1, wherein said device is a multiplexer multiplexing the optical signals transmitted from the plurality of optical transmission paths to the single optical transmission path; each of said plurality of holograms of the holographic device being aligned with one of said plurality of optical transmission paths, and its holographic optical element being effective to collimate the light of the respective channel and to diffract it in a different direction for each channel; said single hologram of the holographic device being aligned with said single optical transmission path, and its plurality of holographic optical elements being effective to focus the collimated light of the respective channel onto the single optical transmission path.
Claim 5
Dependent Claim
49 words
The device according to claim 3 for multiplexing the optical signals transmitted through the plurality of optical transmission paths to the single optical transmission path and also comprising a demultiplexer for demultiplexing the optical signals transmitted through the single optical transmission path to the plurality of optical transmission paths.
Claim 6
Dependent Claim
19 words
The device according to claim 1, wherein each of said optical transmission paths is defined by an optical fiber.
Claim 7
Dependent Claim
32 words
The device according to claim 1, wherein each of said holographic optical elements has high diffraction efficiency for the wavelength of its respective channel and low diffraction efficiency for all other wavelengths.
Claim 8
Dependent Claim
27 words
The device according to claim 1, wherein said substrate includes a light transparent plate and an emulsion coating thereon on which said holographic optical elements are recorded.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-27 | 2001-04-28 | 2001-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-27 | 2005-04-28 | 2005-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-27 | 2009-04-28 | 2009-10-28 | $7700.00 | Window Closed / Lapsed |