Patent US3686584A successfully refreshed from Google Patents.
US3686584A
Expired / Lapsed
US
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Gas laser having a capillary tube with a contracted portion that serves as a mode selector
Assignee: Siemens AG
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Filing: 1970-12-02
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Granted: 1972-08-22
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Expires: 1990-12-02
Abstract
Abstract A gas laser of the type including a discharge tube closed at its opposite ends by Brewster windows or mirrors and having a laseractive medium contained therein is characterized by the discharge tube having a central, capillary tube portion formed with a contracted section having an internal bore. The contracted section has a small axial extent with respect to the capillary tube portion and is formed with an optimum internal diameter for producing a gas laser which operates in a desired mode.
Inventors
- 👤 Hermann Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:36
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/03; H01S3/032; H01S3/0323
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A method of forming a discharge tube for a gas laser comprising the steps of providing a glass tube having an internal through bore formed with a centrally disposed capillary tube portion and larger diametered end sections; and inserting a precisely sized pin axially into the capillary tube portion, said pin having an outer diameter which will produce a gas laser discharge tube that oscillates in a predetermined mode; locally heating the tube radially outwardly of the inserted pin in the region of the capillary tube portion; and shrinking the tube at the heated region onto the pin and then withdrawing the pin to form a contracted portion having an internal bore formed with a diameter depending upon the outer diameter of the sizing pin.
Claim 2
Independent Claim
125 words
A method of forming a discharge tube for a gas laser comprising the steps of providing a glass tube having an internal through bore formed with a centrally disposed capillary tube portion and larger diametered end sections; and inserting a precisely sized pin axially into the capillary tube portion, said pin having an outer diameter which will produce a gas laser discharge tube that oscillates in a predetermined mode; locally heating the tube radially outwardly of the inserted pin in the region of the capillary tube portion; and shrinking the tube at the heated region onto the pin and then withdrawing the pin to form a contracted portion having an internal bore formed with a diameter depending upon the outer diameter of the sizing pin.
Claim 3
Dependent Claim
97 words
In a gas laser, a discharge tube having an internal through bore formed with a centrally disposed capillary portion and larger diametered outer, opposed end sections, the improvement of the capillary tube portion having an internal diameter larger than an optimum diameter for producing a discharge tube for a gas laser that oscillates at a predetermined mode; and a contracted portion forming an internal bore substantially coaxial of the capillary tube portion and being of an optimum, empirically determined diameter for producing a discharge tube for use in a gas laser that oscillates at the predetermined mode.
Claim 4
Dependent Claim
97 words
In a gas laser, a discharge tube having an internal through bore formed with a centrally disposed capillary portion and larger diametered outer, opposed end sections, the improvement of the capillary tube portion having an internal diameter larger than an optimum diameter for producing a discharge tube for a gas laser that oscillates at a predetermined mode; and a contracted portion forming an internal bore substantially coaxial of the capillary tube portion and being of an optimum, empirically determined diameter for producing a discharge tube for use in a gas laser that oscillates at the predetermined mode.
Claim 5
Dependent Claim
36 words
In a gas laser, a discharge tube according to claim 2, said contracted portion having an axial extent substantially less than the axial extent of the capillary tube portion and being disposed near one end thereof.
Claim 6
Dependent Claim
98 words
A gas laser operable at a predetermined mode comprising a gas filled discharge tube having a central bore therethrough with said bore having opposite ends sections closed by windows set at Brewster''s angle, said tube including a capillary section intermediate said opposite end sections having an internal bore diameter less than that of said opposite end section and slightly greater than the diameter which will produce the optimum value of the predetermined mode, said capillary section having a contracted portion at which said central bore has a diameter which will produce the optimum value of the predetermined mode.
Claim 7
Dependent Claim
98 words
A gas laser operable at a predetermined mode comprising a gas filled discharge tube having a central bore therethrough with said bore having opposite ends sections closed by windows set at Brewster''s angle, said tube including a capillary section intermediate said opposite end sections having an internal bore diameter less than that of said opposite end section and slightly greater than the diameter which will produce the optimum value of the predetermined mode, said capillary section having a contracted portion at which said central bore has a diameter which will produce the optimum value of the predetermined mode.
Claim 8
Dependent Claim
20 words
A gas laser according to claim 4 wherein said contracted portion is disposed adjacent one of said opposite end sections.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |