Patent US4968138A successfully refreshed from Google Patents.
US4968138A
Expired / Lapsed
US
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System for monitoring intensity during holographic exposure
Assignee: Raytheon Co
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Filing: 1988-12-08
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Granted: 1990-11-06
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Expires: 2008-12-08
Abstract
Abstract A system for monitoring intensity before, during, and after holographic exposure includes a monitoring assembly within an exposure beam and intermediate a light source and a hologram recording assembly. With the monitoring assembly in the exposure beam, a monitoring beam is produced that is directed towards detection elements located outside of the exposure beam. At the same time, the monitoring assembly allows the exposure beam to pass therethrough and onto the hologram recording assembly. The monitoring assembly may include a reflection hologram with an effective shape which is different from the supporting substrate, or glass substrates with an internal reflecting surface. In either event, the exposure beam remains undistorted. The spatial arrangement among the light source, hologram recording assembly, and detection elements are such that a reflected beam from the hologram recording assembly is directed away from the detection elements to avoid incorrect intensity monitoring.
Inventors
- 👤 James E. Scott
- 👤 John E. Wreede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:07
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H1/04; G03H1/0486; G03H2001/0489
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
87 words
A system for monitoring beam uniformity for hologram development, comprising: monitoring means for receiving an exposure beam and transmitting a portion of said exposure beam to a recording assembly, and directing another portion of said exposure beam to detection means thereby producing a monitoring beam having the characteristics of the exposure beam, said monitoring means being operational prior to, during, and after an exposure period; and detection means for receiving a monitoring beam produced by said monitoring means, said monitoring beam being characteristic of said exposure beam.
Claim 2
Independent Claim
87 words
A system for monitoring beam uniformity for hologram development, comprising: monitoring means for receiving an exposure beam and transmitting a portion of said exposure beam to a recording assembly, and directing another portion of said exposure beam to detection means thereby producing a monitoring beam having the characteristics of the exposure beam, said monitoring means being operational prior to, during, and after an exposure period; and detection means for receiving a monitoring beam produced by said monitoring means, said monitoring beam being characteristic of said exposure beam.
Claim 3
Dependent Claim
26 words
The system according to claim 1 further including stop means for stopping light beams which are produced by said recording assembly from impinging said detection means.
Claim 4
Dependent Claim
17 words
The system according to claim 1 wherein said detection means is positioned outside of said exposure beam.
Claim 5
Dependent Claim
31 words
The system according to claim 1 wherein said monitoring means transmits said exposure beam to said recording assembly with substantially the same characteristics as that when said exposure beam is received.
Claim 6
Dependent Claim
13 words
The system according to claim 1 wherein said monitoring means comprises a hologram.
Claim 7
Dependent Claim
21 words
The system according to claim 1 wherein said monitoring means comprises a pair of glass substrate with an inner reflective surface.
Claim 8
Independent Claim
63 words
A system for hologram development, comprising: light source means for producing an exposure beam; detection means for detecting intensity characteristics of said exposure beam; recording means for receiving said exposure beam and developing a hologram; and monitoring means for receiving said exposure beam and for transmitting intensity characteristics of said exposure beam to said detection means without substantial distortion of said exposure beam.
Claim 9
Independent Claim
63 words
A system for hologram development, comprising: light source means for producing an exposure beam; detection means for detecting intensity characteristics of said exposure beam; recording means for receiving said exposure beam and developing a hologram; and monitoring means for receiving said exposure beam and for transmitting intensity characteristics of said exposure beam to said detection means without substantial distortion of said exposure beam.
Claim 10
Dependent Claim
16 words
The system according to claim 7 wherein said monitoring means is positioned within said exposure beam.
Claim 11
Dependent Claim
17 words
The system according to claim 7 wherein said detection means is positioned outside of said exposure beam.
Claim 12
Dependent Claim
24 words
The system according to claim 7 wherein said detection means and light source means are positioned opposite an incident side of said monitoring means.
Claim 13
Dependent Claim
20 words
The system according to claim 7 wherein said recording means reflected said exposure beam substantially away from said detection means.
Claim 14
Dependent Claim
57 words
In an improved system for monitoring exposure beam intensity during holographic exposure wherein a detection subsystem is positioned outside of said exposure beam, the improvement comprising: a monitoring assembly having a hologram for receiving said exposure beam and then transmitting said exposure beam to a hologram recording assembly while providing a monitoring beam to said detection subsystem.
Claim 15
Dependent Claim
57 words
In an improved system for monitoring exposure beam intensity during holographic exposure wherein a detection subsystem is positioned outside of said exposure beam, the improvement comprising: a monitoring assembly having a hologram for receiving said exposure beam and then transmitting said exposure beam to a hologram recording assembly while providing a monitoring beam to said detection subsystem.
Claim 16
Dependent Claim
13 words
The improvement according to claim 12 wherein said hologram is a reflection hologram.
Claim 17
Dependent Claim
22 words
The improvement according to claim 12 wherein said monitoring assembly has a configuration that corresponds to a configuration of said exposure beam.
Claim 18
Dependent Claim
16 words
The improvement according to claim 12 wherein said hologram has a diffraction efficiency of approximately 10%.
Claim 19
Dependent Claim
20 words
The improvement according to claim 12 further including means for imparting motion to said monitoring assembly to reduce coherent noise.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |