US3598466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic correction process for optical system aberrations
Assignee: Eltro GmbH and Co
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Filing: 1970-05-11
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Granted: 1971-08-10
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Expires: 1990-05-11
Abstract
Abstract A hologram is produced by a corrective optical system operative in the visible radiation band, and the hologram is incorporated in an infrared optical image-reproducing system to correct aberrations of the infrared optical system. The visible radiation optical system is constructed to have aberrations identical to those of the infrared optical image system and the hologram is combined with the infrared optical system after magnification of the hologram on a linear scale of reproduction by the ratio of the IR wavelength to the wavelength in the visible band.
Inventors
- 👤 Wolfgang Friedl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A process for the holographic correction of aberrations in an optical system by production of a hologram and by combining the hologram with the optical system, the process comprising first constructing an optical system in the visible band with aberrations identical with those of an infrared optical system to be corrected, making a hologram with visible radiation for the correction of the infrared optical system and combining the hologram with the infrared optical system after magnification of the hologram on a linear scale of reproduction in the ratio IR wavelength/wavelength in visible band.
Claim 2
Dependent Claim
93 words
A process for the holographic correction of aberrations in an optical system by production of a hologram and by combining the hologram with the optical system, the process comprising first constructing an optical system in the visible band with aberrations identical with those of an infrared optical system to be corrected, making a hologram with visible radiation for the correction of the infrared optical system and combining the hologram with the infrared optical system after magnification of the hologram on a linear scale of reproduction in the ratio IR wavelength/wavelength in visible band.
Claim 3
Dependent Claim
68 words
A process according to claim 1 comprising selecting optical glass for the optical system for the production of the hologram with the same refractive index for a wavelength in the visible range as the optically infrared material for the wavelength to be corrected in the infrared range, so that the optical system in glass with the same geometric data also produces the same aberrations as the infrared system.
Claim 4
Dependent Claim
70 words
A process according to claim 1, wherein the geometric characteristics for the hologram producing system for a wavelength in the visible band produces, at that wavelength, the same aberrations as does the system to be hologram-corrected for the selected wavelength in the infrared band, said geometric characteristics satisfying the Aberration formulas of the fifth order when refractive indices are prespecified for a wavelength in the infrared and visible bands respectively.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein the hologram is produced by the use of photographic materials.
Claim 6
Dependent Claim
19 words
A process according to claim 1, wherein the magnification of the hologramic is also produced by a holograph process.
Claim 7
Dependent Claim
26 words
A process according to claim 1, wherein the magnification of the hologram is produced by geometrical optical reproduction by a corrected system of large aperture ratio.
Claim 8
Dependent Claim
15 words
A process according to claim 1, wherein the optical system consists of only one lens.
Claim 9
Dependent Claim
24 words
A process according to claim 1, wherein the hologram is photographic and is converted into a phase hologram for employment in the infrared system.
Claim 10
Dependent Claim
34 words
A process according to claim 8, wherein the phase hologram is given a reflecting surface by metallic vapor deposition, thus additionally facilitating a change of direction of the optical axis in the ray configuration.
Claim 11
Dependent Claim
17 words
A process according to claim 1, wherein the hologram is impressed onto a surface of a lens.
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) | 1974-08-09 | 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 |