US4027948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low loss laser modulator
Assignee: United States Department of the Army
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Filing: 1976-03-15
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Granted: 1977-06-07
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Expires: 1996-03-15
Abstract
Abstract Laser light is polarized and sent through a low loss rotator. The amount ofotation is modulated by a modulator source. The laser light is then sent through a further polarizer where its intensity will be modulated in accordance with the variable rotation imparted upon it.
Inventors
- 👤 George A. Tanton
- 👤 Harry C. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G02F1/093; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/88
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
165 words
A system comprising electro-magnetic radiation polarized at a first angle; controlled means for rotating the polarization angle of said radiation; analyzer means for varying the intensity output of said radiation in accordance to the polarization angle; signal means connected to said controlled means so as to cause a change in the polarization angle in proportion to the value of the signal means; said radiation being directed through said controlled means to and through said analyzer means; said electro-magnetic radiation is a beam of laser radiation at a predetermined frequency; polarizer means positioned between said laser radiation and said controlled means so as to provide the polarization of the laser beam; said analyzer is a further polarizer means; said controlled means comprises a modulating material containing two narrow absorption lines either side of said predetermining frequency of said laser beam; and a field producing means for producing a static electro-magnetic field aligned through said modulated material in the direction of said travel of said laser beam.
Claim 2
Independent Claim
165 words
A system comprising electro-magnetic radiation polarized at a first angle; controlled means for rotating the polarization angle of said radiation; analyzer means for varying the intensity output of said radiation in accordance to the polarization angle; signal means connected to said controlled means so as to cause a change in the polarization angle in proportion to the value of the signal means; said radiation being directed through said controlled means to and through said analyzer means; said electro-magnetic radiation is a beam of laser radiation at a predetermined frequency; polarizer means positioned between said laser radiation and said controlled means so as to provide the polarization of the laser beam; said analyzer is a further polarizer means; said controlled means comprises a modulating material containing two narrow absorption lines either side of said predetermining frequency of said laser beam; and a field producing means for producing a static electro-magnetic field aligned through said modulated material in the direction of said travel of said laser beam.
Claim 3
Dependent Claim
21 words
A system as set forth in claim 1 wherein field producing means is a superconducting solenoid wrapped around said modulating material.
Claim 4
Dependent Claim
75 words
A system as set forth in claim 1 wherein field producing means will cause a polarization plane shift of a first predetermined number of degrees from said first angle; and said analyzer means having this polarization plane shifted with respect to the first polarizer a number of degrees different from said first predetermined number of degrees by an amount greater than the amount that said signal means can cause additional rotation of said polarization plane.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |