Patent US3598467A successfully refreshed from Google Patents.
US3598467A
Expired / Lapsed
US
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Er optic diffuser for holography
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1969-03-28
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Granted: 1971-08-10
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Expires: 1989-03-28
Abstract
Abstract a4 182 A holographic apparatus capable of utilizing a pulsed laser developing an incompletely coherent light beam for recording holograms. The apparatus makes use of a bundle of transparent fibers used as a new optical element. This fiber bundle serves both the purpose of directing the light toward the object to be recorded and of scrambling or diffusing the light from the source. Essentially each fiber of the fiber bundle creates a cone of light which illuminates substantially the entire object. As a result, at the recording material for the hologram there is at least a component or portion of the scene beam capable of interfering with a component of the reference beam. The fiber bundle also makes it possible to direct the light beam around obstacles or close to an object for holograhic microscopy or for taking holograms of an object in a hostile environment such as a rocket engine generating a great amount of heat. The holograms may be made both of objects in reflection and in transmission.
Inventors
- 👤 Durk Jon Pearson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:01
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/04; G02B6/06; G03; G03H; G03H1/00; G03H1/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A holographic apparatus having improved spatial coherence and substantially uniform amplitude and phase distribution comprising: a. a solid-state laser for generating a beam of substantially monochromatic but incompletely spatially coherent light; b. a recording material disposed in predetermined plane for recording a hologram of an object; c. a bundle of a large number of transparent fibers disposed in the path of said beam generated by said laser, said bundle having an entrance face formed by said fibers and facing said laser, said face being a smooth shape to reflect a portion of said laser beam so as to generate a reference beam, the remaining portion of said laser beam being transmitted by said face and being diffused by transmission through said bundle to generate a diffused scenes beam, said bundle directing said diffused scene beam onto an object; and d. reflector meAns for directing said reference beam onto said recording material.
Claim 2
Dependent Claim
151 words
A holographic apparatus having improved spatial coherence and substantially uniform amplitude and phase distribution comprising: a. a solid-state laser for generating a beam of substantially monochromatic but incompletely spatially coherent light; b. a recording material disposed in predetermined plane for recording a hologram of an object; c. a bundle of a large number of transparent fibers disposed in the path of said beam generated by said laser, said bundle having an entrance face formed by said fibers and facing said laser, said face being a smooth shape to reflect a portion of said laser beam so as to generate a reference beam, the remaining portion of said laser beam being transmitted by said face and being diffused by transmission through said bundle to generate a diffused scenes beam, said bundle directing said diffused scene beam onto an object; and d. reflector meAns for directing said reference beam onto said recording material.
Claim 3
Dependent Claim
170 words
A holographic apparatus having improved spatial coherence and substantially uniform amplitude and phase distribution comprising: a. a solid-state laser for generating a beam of substantially monochromatic but incompletely spatially coherent light; b. a recording material disposed in a predetermined plane for recording a hologram of an object; c. optical means for splitting said beam of light into a reference beam and a scene beam; d. reflector means for directing said reference beam onto said recording material; and e. a bundle of a large number of transparent fibers interposed into the path of said scene beam and ahead of an object for scrambling the light from said laser and for directing it onto the object, said bundle of transparent fibers having a cross section facing said optical means matching the cross section of said scene beam, and having a cross section facing the object substantially matching the projection of the object taken by said scene beam, thereby to direct substantially all of the light of said scene beam onto the object.
Claim 4
Dependent Claim
170 words
A holographic apparatus having improved spatial coherence and substantially uniform amplitude and phase distribution comprising: a. a solid-state laser for generating a beam of substantially monochromatic but incompletely spatially coherent light; b. a recording material disposed in a predetermined plane for recording a hologram of an object; c. optical means for splitting said beam of light into a reference beam and a scene beam; d. reflector means for directing said reference beam onto said recording material; and e. a bundle of a large number of transparent fibers interposed into the path of said scene beam and ahead of an object for scrambling the light from said laser and for directing it onto the object, said bundle of transparent fibers having a cross section facing said optical means matching the cross section of said scene beam, and having a cross section facing the object substantially matching the projection of the object taken by said scene beam, thereby to direct substantially all of the light of said scene beam onto the object.
References Cited (Backward Citations)
US3255357A
Cited
US3405614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |