US3821664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave excited gas laser
Assignee: Alcatel Lucent SAS
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Filing: 1973-03-19
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Granted: 1974-06-28
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Expires: 1993-03-19
Abstract
Abstract A gas laser comprising an electric excitation line consisting of a sandwich of two metal plates separated by an insulating plate. The metal plates are in the form of parabolas, the focal points and the apices of the parabolas being situated on respective normals to the plane of the plates. Each metal plate has a discharge channel containing an active laser medium.
Inventors
- 👤 B Godard
- 👤 G Yvette
- 👤 B Lacour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/06; H01S3/07; H01S3/073; H01S3/076; H01S3/09; H01S3/097; H01S3/0971; H01S3/0973
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
224 words
A traveling wave transmission line system for excitation of a laser having an active laser medium comprising: a first substantially flat, electrically conductive metallic plate, said first metallic plate having a first discharge channel for receiving an active laser medium and for dividing said first metallic plate into two distinct portions; a second substantially flat, electrically conductive metallic plate separated from, and substantially parallel to, said first metallic plate and having a second discharge channel for receiving an active laser medium therein and for dividing said second metallic plate into two distinct portions, each forming an end of a first transmission line; said second discharge channel being disposed substantially opposite said first discharge channel; an insulating plate sandwiched between said first and second metallic plates to form said first transmission line; said second metallic plate at a first end thereof being formed as a parabola with an axis of symmetry at an angle to the longitudinal axis of said channel; a substantially point source of electric waves located at the focus of the parabola; pulse charge excitation means coupled to said first end of said transmission line and including means for shorting said line to produce said electric waves at said fOcus for reflection from said parabolic surface toward said channels as a plane wave perpendicular to said axis of symmetry of said parabola.
Claim 2
Dependent Claim
224 words
A traveling wave transmission line system for excitation of a laser having an active laser medium comprising: a first substantially flat, electrically conductive metallic plate, said first metallic plate having a first discharge channel for receiving an active laser medium and for dividing said first metallic plate into two distinct portions; a second substantially flat, electrically conductive metallic plate separated from, and substantially parallel to, said first metallic plate and having a second discharge channel for receiving an active laser medium therein and for dividing said second metallic plate into two distinct portions, each forming an end of a first transmission line; said second discharge channel being disposed substantially opposite said first discharge channel; an insulating plate sandwiched between said first and second metallic plates to form said first transmission line; said second metallic plate at a first end thereof being formed as a parabola with an axis of symmetry at an angle to the longitudinal axis of said channel; a substantially point source of electric waves located at the focus of the parabola; pulse charge excitation means coupled to said first end of said transmission line and including means for shorting said line to produce said electric waves at said fOcus for reflection from said parabolic surface toward said channels as a plane wave perpendicular to said axis of symmetry of said parabola.
Claim 3
Dependent Claim
48 words
A transmission line system as defined in claim 1 further comprising: first and second insulating strips respectively fixed onto said first and second metallic plates and respectively covering said first and second channels; and windows, transparent to radiation emitted by the laser, closing both ends of said channels.
Claim 4
Dependent Claim
117 words
A transmission line system as defined in claim 1 further comprising a second transmission line substantially identical to said first transmission line, the first metallic plate of said second transmission line being common with the first metallic plate of the said first transmission line, the parabolas formed by the first ends of the second metallic plates of said first and second transmission lines being substantially identical and having their foci and apices lying on the same respective normals to the planes of said metallic plates, said shorting means producing said electric waves at both said foci for reflection from both parabolic surfaces towards said channels as plane waves perpendicular to the axis of symmetry of said parabolas.
Claim 5
Dependent Claim
58 words
A transmission line system as defined in claim 3 further comprising first and second insulating strips respectively covering the discharge channels in the second metallic plates of said first and second transmission lines, the discharge channel in the common first metallic plate of said first and second lines being closed by the insulating plates of said transmission lines.
Claim 6
Dependent Claim
91 words
A transmission line as defined in claim 1 wherein said first metallic plate at a first end thereof is also formed as a parabola, the dimensions of the parabolas of said first and second metallic plates being substantially identical, the foci and apices of the parabolas lying on the same respective normals to the planes of said metallic plates, said shorting means producing said electric wave at both said foci for reflection from both parabolic surfaces toward said channels as plane waves perpendicular to the axes of symmetry of said parabolas.
Claim 7
Dependent Claim
128 words
A transmission line system as claimed in claim 5 wherein said excitation means comprises two spaced electrodes arranged substantially along the same axis in a chamber of a dielectric material and containing a gas, the chamber passing through said first and second metallic plates as well as said insulating plate, and being positioned so that the axis along which said electrodes are situated passes substantially through the foci of the parabolas, the chamber being formed by a tube arranged in bores in first and second metal blocks separated by an insulating material, said first block being carried on said first metallic plate and said second block being carried on said second metallic plate, the ends of the tube being closed by flat seals through which said electrodes pass.
Claim 8
Dependent Claim
25 words
A transmission line system as claimed in claim 6, wherein the space between the tube and the metal blocks is sealed with an insulating material.
Claim 9
Dependent Claim
50 words
A transmission line system as claimed in claim 7, wherein an annular groove is formed in both metal blocks on their inner faces, the insulating plates only extending through this annular groove to abut the tube, and wherein the space surrounding the insulating plate is filled with the insulating material.
Claim 10
Dependent Claim
41 words
A transmission line system as claimed in claim 6 wherein the electrodes are connected to the respective metal plates by one of the metal blocks and by an additional metal plate disposed on the upper face of the other metal block.
Claim 11
Dependent Claim
27 words
A transmission line system as claimed in claim 9, wherein the electrodes are helf firmly in position by washers which are screwed to their respective metal blocks.
Claim 12
Dependent Claim
26 words
A transmission line system as claimed in claim 10, wherein a toroidal seal is placed inside the washers to ensure a gas-tight seal of the electrodes.
Claim 13
Dependent Claim
32 words
A transmission line system as claimed in claim 6, wherein the electrodeS are hollow and are provided with apertures in their walls so that a gas may be introduced into the tube.
Claim 14
Dependent Claim
55 words
A transmission line system as claimed in claim 1 wherein said insulating plate is a flexible insulating strip, and said metallic plates comprise respective metallic layers deposited on opposite sides of a flexible insulating sheet so as to form a non-rigid assembly, and further comprising means for maintaining the medium in each of the channels.
Claim 15
Dependent Claim
54 words
A transmission line system as claimed in claim 13, wherein the means for maintaining the medium in each of the channels of the metallic layers comprises an insulating strip resting on metallic wedges having a length approximately equal to that of the insulating strip and disposed on either side of each of the channels.
Claim 16
Dependent Claim
67 words
A transmission line system as claimed in claim 13 comprising a second transmission line substantially identical to said first transmission line, the first metallic layer of the second line being separated from the second metallic layer of the first line by metal wedges having a length substantially equal to that of the insulating strips and disposed on either side of the channels arranged in the metallic layers.
Claim 17
Dependent Claim
70 words
A transmission line system as claimed in claim 15 wherein the first channel of the first metallic layer of the first electric excitation line and the channel of the second metal layer of the second electric excitation line are each closed off by an insulating strip resting on metallic wedges having a length substantially equal to that of the insulating strip and being disposed on either side of the channels.
Claim 18
Dependent Claim
42 words
A transmission line system as claimed in claim 13 wherein said excitation means comprises a trigger device disposed adjacent the channels by folding said flexible insulating sheet and associated metal layers back on themselves, the assembly being surrounded by a protective envelope.
Claim 19
Dependent Claim
19 words
A transmission line system as claimed in claim 17, wherein the protective envelope is formed by a polyethylene cover.
Claim 20
Dependent Claim
84 words
A transmission line system as claimed in claim 3 wherein said excitation means comprises at least one electrode disposed coaxially in a bore formed in the plates of the excitation lines, the axis XX'' of the bore being perpendicular to the plane of the plates and passing through the focal points of the parabolas, wherein the electrode is adapted to be held at a constant potential and connected to a pulse generator having an amplitude at least equal to the value of the potential.
Claim 21
Dependent Claim
73 words
A transmission line system as claimed in claim 19 further comprising a third transmission line identical to said first and second lines, and wherein alternate metal plates of the transmission lines are adapted to be held at a potential substantially equal to the sum of the potential of the electrode and the amplitude of the pulses from the pulse generator, while the intermediate plates are adapted to be held at substantially earth potential.
Claim 22
Dependent Claim
62 words
A transmission line system as claimed in claim 19 wherein the electrode is held at a desired potential having a substantially constant value by connecting the electrode to a source potential having a value double that of the desired potential and to a source of zero potential, this connection being effected through the intermediary of two resistors R having substantial equal resistance.
Claim 23
Dependent Claim
38 words
A transmission line system as claimed in claim 19 wherein the alternate plates of the transmission lines are adapted to be connected to a source of potential whereas the intermediate plates are adapted to be connected to earth.
Claim 24
Dependent Claim
42 words
A transmission line system as claimed in claim 19 wherein the distance between the electrode and the metal plates is chosen so that the discharge only occurs for a value of electrode potential which is substantially equal to double said constant potential.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |