Claims
- 1. In a method of producing and reproducing a hologram using an image-forming system having object and reference beams, coding optical means, decoding optical means, aperture stop means and a base layer by superposing said object and reference beams which originate from the same light source, on said base layer, said object beam carrying a first set of information, the improvement comprising:
- disposing said coding means in the path of said object beam between said aperture stop and said base layer, wherein said coding means comprises a first phase-modifying optical element having a surface relief pattern on one surface which produces predetermined phase disturbances in said first set of information, and having another surface curved to form a lens surface;
- recording the coded first set of information in said base layer and developing said base layer to form said hologram; and
- reconstructing the first set of information by placing said decoding means in the path of a reconstruction beam, wherein said decoding means comprises a second phase-modifying optical element having a surface relief pattern on one surface which produces complementary phase disturbances to said predetermined phase disturbances produced by said coding means, and having another surface curved to form a lens element of said image-forming system and produce an undistorted image of the first set of information.
- 2. The method of claim 1 wherein said optical element of the decoding means is a holographic optical element.
- 3. The method of claim 1 further comprising:
- disposing a second set of information within said aperture stop means so that said first and second sets of information are recorded and reconstructed in a superimposed relation.
- 4. A method according to claim 1 including disposing a third phase-modifying optical element in the object beam during recording, the first and said third phase-modifying optical elements being located on opposite sides of the aperture stop.
- 5. A method according to claim 1 wherein the first phase-modifying optical element is a Fresnel zone plate or a plurality of parts of different Fresnel zone plates.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3327463 |
Jul 1983 |
DEX |
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Parent Case Info
This is a continuation of co-pending application Ser. No. 634,063, filed on July 25, 1984, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2840556 |
Mar 1980 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Lohmann, IBM Technical Disclosure Bulletin, vol. 8, No. 10, Mar. 1966, p. 1402. |
Continuations (1)
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Number |
Date |
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Parent |
634063 |
Jul 1984 |
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