US3700303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Efficient illumination of the cores only of a fiber optic bundle using holography
Assignee: American Optical Corp
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Filing: 1971-05-19
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Granted: 1972-10-24
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Expires: 1991-05-19
Abstract
Abstract Holographic method of recording and reconstructing a wavefront, from an array of light spots on a dark field, to propagate the reconstructed wavefront so as to illuminate the light spots to the exclusion of the dark field.
Inventors
- 👤 Luther W Smith
- 👤 Elias Snitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
A method of directing light at the cores only of a bundle of optical fibers, each such fiber including a core and cladding, comprising the steps of: illuminating one end of said bundle of optical fibers and recording a photographic image of the light emitted from the opposite end of said bundle, recording a hologram of said photographic image, said photographic image consisting of an array of distinct spots on a dark field, wherein said spots are the images of the light emitted from said cores and said dark field represents the area of the cladding illuminating the hologram to thereby reconstruct a wavefront which represents said photographic image, projecting this wavefront to form an image array of light spots of the same size and spacing as said light emitted from said other end of said fiber optic bundle on said other end and aligning the light spot images with said cores, thus illuminating the cores only of the bundle, and conducting light energy to the first end of said bundle through said cores only.
Claim 2
Independent Claim
175 words
A method of directing light at the cores only of a bundle of optical fibers, each such fiber including a core and cladding, comprising the steps of: illuminating one end of said bundle of optical fibers and recording a photographic image of the light emitted from the opposite end of said bundle, recording a hologram of said photographic image, said photographic image consisting of an array of distinct spots on a dark field, wherein said spots are the images of the light emitted from said cores and said dark field represents the area of the cladding illuminating the hologram to thereby reconstruct a wavefront which represents said photographic image, projecting this wavefront to form an image array of light spots of the same size and spacing as said light emitted from said other end of said fiber optic bundle on said other end and aligning the light spot images with said cores, thus illuminating the cores only of the bundle, and conducting light energy to the first end of said bundle through said cores only.
Claim 3
Dependent Claim
40 words
A method as defined in claim 1 further including the steps of: magnifying the image of said field prior to photographing the same, and correspondingly demagnifying the photographic image in projecting said photographic image to the plane of said field.
References Cited (Backward Citations)
US3506327A
Cited
US3627400A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |