US4880286A
Expired / Lapsed
US
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Making a holographic optical element using a computer-generated-hologram
Assignee: DELAWARE A NOT FOR PROFIT CORP OF DE, University of
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Filing: 1987-10-19
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Granted: 1989-11-14
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Expires: 2007-10-19
Abstract
Abstract A method of producing an IR hologram having a planar surface on which a fringe pattern is recorded, the fringe pattern being produced by interference with a visible wavelength on the surface of reconstruction from a computer generated hologram.
Inventors
- 👤 Charles C. Ih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:50
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/08; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A method of producing a high resolution infrared hologram with the aid of a digital computer comprising defining mathematically a final infrared hologram by specifying mathematically a first object beam and a first reference beam at a fist wavelength, determining a computer generated hologram (CGH) by calculating a reconstructed wavefront from said mathematically defined IR hologram at a second wavelength by computer calculation using the Welford equation, interfering mathematically said reconstructed wavefront with a second reference beam to determine said CGH by computer calculations at said second wavelength, physically implementing the determined CGH, and then reconstructing by a reconstruction beam at the second wavelength and conjugate to the second reference beam, creating a distorted wavefront, and making the said final IR hologram by mixing said reconstruction wavefront with a beam conjugate to said first reference beam at said second wavelength.
Claim 2
Independent Claim
140 words
A method of producing a high resolution infrared hologram with the aid of a digital computer comprising defining mathematically a final infrared hologram by specifying mathematically a first object beam and a first reference beam at a fist wavelength, determining a computer generated hologram (CGH) by calculating a reconstructed wavefront from said mathematically defined IR hologram at a second wavelength by computer calculation using the Welford equation, interfering mathematically said reconstructed wavefront with a second reference beam to determine said CGH by computer calculations at said second wavelength, physically implementing the determined CGH, and then reconstructing by a reconstruction beam at the second wavelength and conjugate to the second reference beam, creating a distorted wavefront, and making the said final IR hologram by mixing said reconstruction wavefront with a beam conjugate to said first reference beam at said second wavelength.
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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |