US3612896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Achromatic optical upconverter
Assignee: United States Department of the Army
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Filing: 1970-05-15
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Granted: 1971-10-12
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Expires: 1990-05-15
Abstract
Abstract An achromatic optical upconverter having a pump source, an object source, a nonlinear optical material, and a filter for passing the sum of the pump and object frequencies. A lens, which forms a real image of the object, directs the object rays toward the entrance face of the nonlinear material. A dichroic mirror or beam splitter mounted in the path of the object rays pass the object rays and reflect the pump rays toward the entrance face of the nonlinear material. The lens and the nonlinear material are spaced along the optical axis a distance such that chromatic abberations caused by the lens are eliminated by the nonlinear material which produces an equal and opposite effect and vice versa.
Inventors
- 👤 Arthur H Firester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/353; G02F1/3534
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
An image converter comprising an object source means for radiating energy over a first band of frequencies; focusing means having a frequency dependent focal length for forming images of said object source means spaced along an optical axis; said images being spaced from each other a distance substantially proportional to the difference in image wavelength; a pump source means for radiating pump energy at a pump frequency; a nonlinear mixing means mounted on said optical axis for mixing energy at said pump and object frequencies; means for directing said pump and object energy at said mixing means; and said mixing means being spaced from one of said images a distance proportional to the suM of the wavelength of said pump energy and the wavelength of said one of said images.
Claim 2
Dependent Claim
130 words
An image converter comprising an object source means for radiating energy over a first band of frequencies; focusing means having a frequency dependent focal length for forming images of said object source means spaced along an optical axis; said images being spaced from each other a distance substantially proportional to the difference in image wavelength; a pump source means for radiating pump energy at a pump frequency; a nonlinear mixing means mounted on said optical axis for mixing energy at said pump and object frequencies; means for directing said pump and object energy at said mixing means; and said mixing means being spaced from one of said images a distance proportional to the suM of the wavelength of said pump energy and the wavelength of said one of said images.
Claim 3
Dependent Claim
25 words
The device according to claim 1 and wherein said one of said images has a frequency substantially equal to the center frequency in said band.
Claim 4
Dependent Claim
34 words
The device according to claim 2 and wherein the constants of proportionality related to the spacing of said images and the spacing of said mixing means from said one of said images are equal.
Claim 5
Dependent Claim
27 words
The device according to claim 3 and wherein said pump source means includes a laser means and said pump energy is in the form of plane waves.
Claim 6
Dependent Claim
32 words
The device according to claim 4 and further including a filter means mounted at the output of said mixing means for passing energy at the sum of said pump and object frequencies.
Claim 7
Dependent Claim
145 words
An image converter comprising an object source means for radiating energy over a first band of frequencies; focusing means having a frequency dependent focal length for forming real images of said object source means along an optical axis; said images being spaced from each other a distance substantially proportional to the differences in image wavelength; a pump source means for radiating pump energy at a pump frequency; a nonlinear mixing means mounted on said optical axis for mixing energy at said pump and object frequencies and for forming a virtual image of said real images at the sum of said object and pump frequencies; said mixing means being located on said optical axis a distance such that the apparent location of said virtual images is proportional to a function of only the pump wavelength and the wavelength of the center frequency of said object source.
Claim 8
Dependent Claim
145 words
An image converter comprising an object source means for radiating energy over a first band of frequencies; focusing means having a frequency dependent focal length for forming real images of said object source means along an optical axis; said images being spaced from each other a distance substantially proportional to the differences in image wavelength; a pump source means for radiating pump energy at a pump frequency; a nonlinear mixing means mounted on said optical axis for mixing energy at said pump and object frequencies and for forming a virtual image of said real images at the sum of said object and pump frequencies; said mixing means being located on said optical axis a distance such that the apparent location of said virtual images is proportional to a function of only the pump wavelength and the wavelength of the center frequency of said object source.
Claim 9
Dependent Claim
27 words
The device according to claim 6 and wherein said pump source means includes a laser means and said pump energy is in the form of plane waves.
Claim 10
Dependent Claim
32 words
The device according to claim 7 and further including a filter means mounted at the output of said mixing means for passing energy at the sum of said pump and object frequencies.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |