Patent US4219786A successfully refreshed from Google Patents.
US4219786A
Expired / Lapsed
US
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Polarization suppression of parasitic modes
Assignee: United States Department of the Army
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Filing: 1978-12-11
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Granted: 1980-08-26
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Expires: 1998-12-11
Abstract
Abstract In a multi-pass laser optical system orthogonal polarization of any two immediately adjacent optical passes allows suppression of internal parasitics caused by overlap of laser radiation on successive passes through a laser oscillator or amplifier, allowing increased operating efficiency and closer spacing of adjacent optical paths.
Inventors
- 👤 Arthur N. Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:04
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/005; H01S3/05; H01S3/08; H01S3/081; H01S3/0811; H01S3/0812
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
In a multi-pass laser system wherein optical radiation through the laser medium passes through a plurality of closely adjacent optical paths for providing a single oscillating mode, the improvement of: means for selecting a single polarization of laser radiation, and means for altering the polarization of the radiation so that any two immediately adjacent optical passes have orthogonal polarizations.
Claim 2
Dependent Claim
59 words
In a multi-pass laser system wherein optical radiation through the laser medium passes through a plurality of closely adjacent optical paths for providing a single oscillating mode, the improvement of: means for selecting a single polarization of laser radiation, and means for altering the polarization of the radiation so that any two immediately adjacent optical passes have orthogonal polarizations.
Claim 3
Dependent Claim
34 words
In a multiple pass laser system as set forth in claim 1 the improvement wherein said means for altering the polarization is a three-mirror array for coupling optical energy between immediately adjacent optical paths.
Claim 4
Dependent Claim
26 words
In a multiple pass laser system as set forth in claim 2 the improvement wherein said means for selecting a single polarization is a diffraction grating.
Claim 5
Dependent Claim
48 words
In a multiple pass laser system as set forth in claim 1 the improvement wherein said means for altering the polarization is a plurality of three-mirror arrays, each of said arrays being adapted for coupling optical energy between immediately adjacent optical paths for providing a single oscillating mode.
Claim 6
Dependent Claim
38 words
In a multiple pass laser system as set forth in claim 1 the improvement wherein said means for altering the polarizaton is a two-mirror array, the two mirrors being tilted at 45° with respect to the optical axis.
Claim 7
Dependent Claim
30 words
In a multiple pass laser system as set forth in claim 5 the improvement wherein said means for selecting a single polarization is a quarter-wave plate and a diffraction grating.
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) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |