GB1278594A - Holographic system having an improved signal-to-noise ratio - Google Patents
Holographic system having an improved signal-to-noise ratioInfo
- Publication number
- GB1278594A GB1278594A GB2958268A GB2958268A GB1278594A GB 1278594 A GB1278594 A GB 1278594A GB 2958268 A GB2958268 A GB 2958268A GB 2958268 A GB2958268 A GB 2958268A GB 1278594 A GB1278594 A GB 1278594A
- Authority
- GB
- United Kingdom
- Prior art keywords
- polarized
- reference beam
- noise ratio
- plane
- diffuser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001427 coherent effect Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000001093 holography Methods 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0486—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2222/00—Light sources or light beam properties
- G03H2222/31—Polarised light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/14—Diffuser, e.g. lens array, random phase mask
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Abstract
1278594 Holography R C A CORPORATION 10 Sept 1969 [20 June 1968] 29582/68 Heading G2J Signal-to-noise ratio of holograms is improved by increasing the proportion of the object beam polarized parallel to the reference beam and decreasing the proportion of the object beam polarized orthogonal to the reference beam. In one embodiment a reference beam 16 of plane polarized light is expanded to form a beam 20 and illuminates a hologram plate 22. An object beam 18 from the same light source is passed through a diffuser 28 to render it randomly polarized and then through a linear polarizer 30 to pass substantially only that portion polarized parallel to the reference beam 20 thereby cutting out that portion of the beam which carries only noise. The beam is then passed through a transparency and a hologram 22 is formed with improved signal-to-noise ratio. In an alternative embodiment the object beam directly illuminates an object without either diffuser or linear polarizer, but a quarter-wave plate oriented at 45 degrees to the plane of polarization of the reference beam is introduced into that latters' path to circularly polarize the reference beam. If the object has a plane polarizing effect upon an incident beam then a coherent light source forming randomly polarized beams may be used.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2958268A GB1278594A (en) | 1968-06-20 | 1968-06-20 | Holographic system having an improved signal-to-noise ratio |
| DE19691931259 DE1931259A1 (en) | 1968-06-20 | 1969-06-20 | Device for recording a hologram |
| CH951069A CH510889A (en) | 1968-06-20 | 1969-06-20 | Device for recording holograms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2958268A GB1278594A (en) | 1968-06-20 | 1968-06-20 | Holographic system having an improved signal-to-noise ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1278594A true GB1278594A (en) | 1972-06-21 |
Family
ID=10293819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2958268A Expired GB1278594A (en) | 1968-06-20 | 1968-06-20 | Holographic system having an improved signal-to-noise ratio |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH510889A (en) |
| DE (1) | DE1931259A1 (en) |
| GB (1) | GB1278594A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8815660D0 (en) * | 1988-07-01 | 1988-08-10 | Nat Res Dev | Underwater inspection apparatus & method |
| EP0772103A3 (en) * | 1995-10-30 | 1998-01-21 | Denso Corporation | A method for producing a hologram and a display device using the same |
-
1968
- 1968-06-20 GB GB2958268A patent/GB1278594A/en not_active Expired
-
1969
- 1969-06-20 DE DE19691931259 patent/DE1931259A1/en active Pending
- 1969-06-20 CH CH951069A patent/CH510889A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CH510889A (en) | 1971-07-31 |
| DE1931259A1 (en) | 1970-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |