US4689798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transverse ring RF line for CO2 laser
Assignee: United States Department of the Army
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Filing: 1986-07-31
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Granted: 1987-08-25
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Expires: 2006-07-31
Abstract
Abstract A far-infrared laser structure is provided wherein a uniform longitudinal ectric field mode is provided for a radio frequency pump by means of a set of fully or near-fully circular ring shaped electrodes.
Inventors
- 👤 Clifton S. Fox
- 👤 John E. Nettleton
- 👤 Dallas N. Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:51
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/034; H01S3/0315; H01S3/038; H01S3/0385; H01S3/09; H01S3/097; H01S3/0975
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
162 words
A gas filled waveguide laser tube for use in a Fabry-Perot cavity to generate electromagnetic radiation (EMR) within a far-infrared band of wavelengths, comprising: an elongated tube of dielectric material having a cross-section necessary to achieve a desired moding or polarization, said tube being characterized by low loss propagation of high frequency EMR; a pair of end caps hermetically sealing the ends of said tube, said caps being transparent to said far-infrared band of EMR; an ionizable polyatomic gas at low pressure within said tube; a pair of diametrically opposed line conductors extending along the axis of said tube for at least the length of the gas filled portion thereof and; a series of ring shaped electrodes having a defined cross-section alternately connected to said conductors and extending around and touching said tube normal to the axis thereof for at least 75% of its circumference, said rings being electrically coupled to said line conductors to form a transmission line for RF excitation.
Claim 2
Dependent Claim
162 words
A gas filled waveguide laser tube for use in a Fabry-Perot cavity to generate electromagnetic radiation (EMR) within a far-infrared band of wavelengths, comprising: an elongated tube of dielectric material having a cross-section necessary to achieve a desired moding or polarization, said tube being characterized by low loss propagation of high frequency EMR; a pair of end caps hermetically sealing the ends of said tube, said caps being transparent to said far-infrared band of EMR; an ionizable polyatomic gas at low pressure within said tube; a pair of diametrically opposed line conductors extending along the axis of said tube for at least the length of the gas filled portion thereof and; a series of ring shaped electrodes having a defined cross-section alternately connected to said conductors and extending around and touching said tube normal to the axis thereof for at least 75% of its circumference, said rings being electrically coupled to said line conductors to form a transmission line for RF excitation.
Claim 3
Dependent Claim
17 words
A laser in accordance with claim 1, wherein: said line conductors extend parallel to said tube axis.
Claim 4
Dependent Claim
16 words
A laser in accordance with claim 1, wherein: said line conductors spiral around said tube axis.
Claim 5
Dependent Claim
22 words
A laser in accordance with claim 1, wherein: said line conductors are spaced from said tube; and ring electrodes are completely circular.
Claim 6
Dependent Claim
39 words
A laser in accordance with claim 1, wherein: said ring electrodes include a gap and; said line conductors contact said tube, pass through the gaps of approximately half of the rings and electrically contact the remainder of said rings.
Claim 7
Dependent Claim
16 words
A laser in accordance with claim 1, wherein: said ring electrodes are plated on said tube.
Claim 8
Dependent Claim
16 words
A laser in accordance with claim 1, wherein: said line conductors are plated on said tube.
Claim 9
Dependent Claim
19 words
A laser in accordance with claim 1, wherein: said tube contains external grooves therein to receive said ring electrodes.
Claim 10
Dependent Claim
19 words
A laser in accordance with claim 1, wherein: said tube contains external grooves therein to receive said line conductors.
Claim 11
Dependent Claim
32 words
A laser in accordance with claim 1, wherein: said rings and said line conductors are encapsulated in a meterial having a loss factor, for RF EMR energy, less than 10 -3 .
Claim 12
Dependent Claim
34 words
A laser in accordance with claim 6, wherein: said plating on said tube is continuous and is separated by grooves normal to said tube axis cut through said plating and slightly into said tube.
Claim 13
Dependent Claim
28 words
A laser in accordance with claim 6, wherein: said line conductors are insulated from every other one of said ring electrodes by a pad of electrical insulation material.
Claim 14
Dependent Claim
28 words
A laser in accordance with claim 11, wherein: said line conductors are insulated from every other one of said ring electrodes by a pad of electrical insulation material.
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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |