Patent JPS5585985A successfully refreshed from Google Patents.
Patent US4796983A successfully refreshed from Google Patents.
US4796983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical frequency shifter using magnetostatic waves
Assignee: Carnegie Mellon University
•
Filing: 1987-06-05
•
Granted: 1989-01-10
•
Expires: 2007-06-05
Abstract
Abstract An optical frequency shifter that uses mode coupling of magnetostatic waves with light having frequency ω o from a laser. A controllable external magnetic biasing field and a controlled microwave source are used to independently specify the frequency ω q and wavenumber K q of the magnetostatic wave. As a result, the mode coupling can be maintained over a range of frequencies ω q so a shifted beam of light ω o ±ω q can be produced.
Inventors
- 👤 Daniel D. Stancil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:21
CPC Classifications
G; G02; G02F; G02F2/00; G02F1/00; G02F1/01; G02F1/09; G02F1/095
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
A frequency shifter comprising: means for producing a monochromatic beam of light having frequency ω o ; means for producing magnetostatic waves having frequency ω q and wavenumber K q ; means for varying the magnetostatic wave frequency ω q while maintaining the magnetostatic wave number K q ; and means for allowing the magnetostatic waves and the beam of light to interact so light having frequency ω o +ω q is produced.
Claim 2
Dependent Claim
73 words
A frequency shifter comprising: means for producing a monochromatic beam of light having frequency ω o ; means for producing magnetostatic waves having frequency ω q and wavenumber K q ; means for varying the magnetostatic wave frequency ω q while maintaining the magnetostatic wave number K q ; and means for allowing the magnetostatic waves and the beam of light to interact so light having frequency ω o +ω q is produced.
Claim 3
Dependent Claim
73 words
A frequency shifter comprising: means for producing a monochromatic beam of light having frequency ω o ; means for producing magnetostatic waves having frequency ω q and wavenumber K q ; means for varying the magnetostatic wave frequency ω q while maintaining the magnetostatic wave number K q ; and means for allowing the magnetostatic waves and the beam of light to interact so light having frequency ω o -ω q is produced.
Claim 4
Dependent Claim
73 words
A frequency shifter comprising: means for producing a monochromatic beam of light having frequency ω o ; means for producing magnetostatic waves having frequency ω q and wavenumber K q ; means for varying the magnetostatic wave frequency ω q while maintaining the magnetostatic wave number K q ; and means for allowing the magnetostatic waves and the beam of light to interact so light having frequency ω o -ω q is produced.
Claim 5
Dependent Claim
20 words
A frequency shifter as described in claim 1 or 2 including means for varying the magnetostatic wavenumber K q .
Claim 6
Dependent Claim
16 words
A frequency shifter as described in claim 3 wherein the monochromatic beam of light is polarized.
Claim 7
Dependent Claim
52 words
A frequency shifter as described in claim 4 wherein the means for varying the magnetostatic wave frequency ω q while maintaining the magnetostatic wavenumber K q includes means for producing a magnetic field, said magnetic field immersing the allowing means such that mode coupling occurs between the light and the magnetostatic waves.
Claim 8
Dependent Claim
47 words
A frequency shifter as described in claim 5 wherein the means for varying the magnetostatic wavenumber K q and the means for varying the magnetostatic wave frequency ωq includes a controller connected to the means for producing magnetostatic waves and to the magnetic field producing means, respectively.
Claim 9
Dependent Claim
39 words
A frequency shifter as described in claim 6 wherein the means for producing magnetostatic waves is at least one transducer located on the allowing means; and a microwave source connected thereto, said microwave source also connected to the controller.
Claim 10
Dependent Claim
104 words
A frequency shifter as described in claim 6 wherein the allowing means is a sample having a film of low microwave loss, low optical absorption and high faraday rotation situated on a substrate that is non-magnetic and uses a lower index of refraction than the film, said sample situated so that the beam of light propagates through the film, and wherein the means for producing magnetostatic waves is a first and second transducer located on the film and producing magnetostatic waves propagating in a direct parallel and antiparallel, respectively, to the propagating light; and a microwave source connected to the first and second transducers.
Claim 11
Dependent Claim
18 words
A frequency shifter as described in claim 8 wherein the film is YIG and the substrated is GGG.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |