Patent US3578837A successfully refreshed from Google Patents.
US3578837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-diffuser holographic system
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1969-04-01
•
Granted: 1971-05-18
•
Expires: 1989-04-01
Abstract
Abstract A holographic system for recording holograms of an object in transmission. In order to make more uniform the spatial coherence and the intensity of the light beam of a laser, a light diffuser is disposed in the path of the scene beam. In addition a second light diffuser is also disposed in the path of the diffused and enlarged scene beam. Preferably the second diffuser has a certain directivity which may be achieved by coating the diffusing surface with a transparent lacquer. In order to further improve the directivity of the second diffuser there may be provided a Fresnel lens having one of its focal points in the first diffuser and the other focal point in the recording material for the hologram. The second diffuser may be replaced by a diffusing and reflecting ellipsoidal section which serves simultaneously the purpose of diffusing the scene beam and directing it from the first diffuser to the recording material.
Inventors
- 👤 Robert E Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:44
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H2001/0413; G03H1/0465; G03H2001/0471; G03H2210/00; G03H2210/10; G03H2210/12; G03H2210/30; G03H2223/00; G03H2223/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A holographic system for recording an object in transmission comprising: a. a laser for developing a substantially monochromatic light beam; b. a beam splitter for splitting said light beam into a reference beam and a scene beam; c. a photosensitive recording material disposed in a predetermined plane for recording a hologram; d. first optical means for directing said reference beam toward said recording material; e. second optical means for directing said scene beam toward said hologram; f. a first light diffuser disposed in the path of said scene beam for diffusing said scene beam; and g. third optical means disposed in the path of said diffused scene beam for approximately focusing said first light diffuser on said recording material and for directing said scene beam toward substantially the entire surface of said recording material and including a second diffuser, an object to be recorded being adapted to be disposed between said third optical means and said recording material, whereby said scene beam is diffused twice by said diffuser so that on substantially every point of said recording material a portion of said scene beam is capable of interfering with a portion of said reference beam.
Claim 2
Dependent Claim
195 words
A holographic system for recording an object in transmission comprising: a. a laser for developing a substantially monochromatic light beam; b. a beam splitter for splitting said light beam into a reference beam and a scene beam; c. a photosensitive recording material disposed in a predetermined plane for recording a hologram; d. first optical means for directing said reference beam toward said recording material; e. second optical means for directing said scene beam toward said hologram; f. a first light diffuser disposed in the path of said scene beam for diffusing said scene beam; and g. third optical means disposed in the path of said diffused scene beam for approximately focusing said first light diffuser on said recording material and for directing said scene beam toward substantially the entire surface of said recording material and including a second diffuser, an object to be recorded being adapted to be disposed between said third optical means and said recording material, whereby said scene beam is diffused twice by said diffuser so that on substantially every point of said recording material a portion of said scene beam is capable of interfering with a portion of said reference beam.
Claim 3
Dependent Claim
42 words
A holographic system as defined in claim 1 wherein said second diffuser consists of a diffusing glass plate having its diffusing surface covered with a layer of transparent material having an index of refraction between that of said glass plate and air.
Claim 4
Dependent Claim
31 words
A holographic system as defined in claim 1 wherein said third optical means includes a Fresnel lens having its focal planes substantially in said first diffuser and in said recording material.
Claim 5
Dependent Claim
45 words
A holographic system as defined in claim 1 wherein said third optical means includes a substantially ellipsoidal section for reflecting and diffusing the light toward said recording material, said ellipsoidal section having its focal points substantially in said first diffuser and in said recording material.
Claim 6
Dependent Claim
180 words
A holographic system for recording an object in transmission comprising: a. a laser for developing a substantially monochromatic light beam; b. a beam splitter for splitting said light beam into a reference beam and a scene beam; c. a photosensitive recording material disposed in a predetermined plane for recording a hologram; d. optical means including a reflector For directing said reference beam toward said recording material; e. a first diffuser interposed into the path of said scene beam; and f. a reflective light diffuser having the shape of a substantially ellipsoidal section having its focal points in said first diffuser and in said recording material for directing and diffusing the scene beam toward said recording material, an object to be recorded being adapted to be disposed between said reflective light diffuser and said recording material whereby the light of said scene beam is scattered twice by said first and reflective light diffuser so that on substantially every point of said recording material there exists a portion of said scene beam capable of interfering with a portion of said reference beam.
Claim 7
Dependent Claim
180 words
A holographic system for recording an object in transmission comprising: a. a laser for developing a substantially monochromatic light beam; b. a beam splitter for splitting said light beam into a reference beam and a scene beam; c. a photosensitive recording material disposed in a predetermined plane for recording a hologram; d. optical means including a reflector For directing said reference beam toward said recording material; e. a first diffuser interposed into the path of said scene beam; and f. a reflective light diffuser having the shape of a substantially ellipsoidal section having its focal points in said first diffuser and in said recording material for directing and diffusing the scene beam toward said recording material, an object to be recorded being adapted to be disposed between said reflective light diffuser and said recording material whereby the light of said scene beam is scattered twice by said first and reflective light diffuser so that on substantially every point of said recording material there exists a portion of said scene beam capable of interfering with a portion of said reference beam.
Claim 8
Dependent Claim
176 words
In a holographic system for recording an object in transmission of the type comprising a laser for developing a substantially monochromatic light beam, a beam splitter for splitting the light beam into a reference and scene beam, a photosensitive recording material for recording a hologram, means for directing the reference beam toward the recording material, means for directing the scene beam toward the hologram, a first light diffuser disposed in the path of the scene beam for diffusing the scene beam and a lens in the path of the scene beam for approximately focusing the first diffuser on the recording material, the improvement comprising: a second light diffuser interposed in the path of the diffused scene beam and ahead of an object to be recorded, said light diffuser directing the scene beam in a forward direction toward the entire surface of the object to be recorded, said light diffuser consisting of a diffusing plate having a transparent layer on its diffusing surface, said layer having an index of refraction between that of said plate and air.
Claim 9
Dependent Claim
176 words
In a holographic system for recording an object in transmission of the type comprising a laser for developing a substantially monochromatic light beam, a beam splitter for splitting the light beam into a reference and scene beam, a photosensitive recording material for recording a hologram, means for directing the reference beam toward the recording material, means for directing the scene beam toward the hologram, a first light diffuser disposed in the path of the scene beam for diffusing the scene beam and a lens in the path of the scene beam for approximately focusing the first diffuser on the recording material, the improvement comprising: a second light diffuser interposed in the path of the diffused scene beam and ahead of an object to be recorded, said light diffuser directing the scene beam in a forward direction toward the entire surface of the object to be recorded, said light diffuser consisting of a diffusing plate having a transparent layer on its diffusing surface, said layer having an index of refraction between that of said plate and air.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |