Patent US3982136A successfully refreshed from Google Patents.
US3982136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary ferroelectric fluoride nonlinear devices
Assignee: AT&T Inc
•
Filing: 1975-07-23
•
Granted: 1976-09-21
•
Expires: 1995-07-23
Abstract
Abstract The nonlinear properties of the ternary ferroelectric barium fluorides permit noncritical phase matching in the vicinity of 1.06 microns at room temperature. The crystals can tolerate powers of up to approximatey 109 watts/cm2 and may be used as the essential element in second harmonic generators. These devices operate at room temperature without any need for sophisticated temperature control.
Inventors
- 👤 John George Bergman, Jr.
- 👤 Glen Robert Crane
- 👤 Howard Joseph Guggenheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:13
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3551
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A device comprising a crystalline body consisting essentially of the compound BaXF 4 , where X is a divalent transition metal ion, collected from the group consisting of Zn, Ni, Co, Fe, Mn and Mg or mixtures thereof, with means for introducing into said crystalline body a beam of coherent plane polarized electromagnetic radiation at 1.06 ± 0.1 microns and means for extracting a beam of coherent electromagnetic radiation at 0.53 ± 0.05 micron emitted from said body, the said body being positioned in such a way that the angle between the beam of first frequency and the optic axis of said crystalline body is such that the first beam and second beam are noncritically phase matched within the crystal.
Claim 2
Independent Claim
120 words
A device comprising a crystalline body consisting essentially of the compound BaXF 4 , where X is a divalent transition metal ion, collected from the group consisting of Zn, Ni, Co, Fe, Mn and Mg or mixtures thereof, with means for introducing into said crystalline body a beam of coherent plane polarized electromagnetic radiation at 1.06 ± 0.1 microns and means for extracting a beam of coherent electromagnetic radiation at 0.53 ± 0.05 micron emitted from said body, the said body being positioned in such a way that the angle between the beam of first frequency and the optic axis of said crystalline body is such that the first beam and second beam are noncritically phase matched within the crystal.
Claim 3
Dependent Claim
21 words
The device of claim 1 where the compound is selected from the group consisting of BaMgF 4 and BaZnF 4 .
Claim 4
Dependent Claim
17 words
The device of claim 1 where the means for extracting the radiation includes a narrow band filter.
Claim 5
Dependent Claim
24 words
The device of claim 2 together with a resonant means of supporting a standing wave of one of said frequencies in said crystalline body.
References Cited (Backward Citations)
US3234475A
Cited
US3262058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |