Patent US4795557A successfully refreshed from Google Patents.
US3993965A
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US
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Laser having improved windows
Assignee: Coherent Inc
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Filing: 1975-02-24
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Granted: 1976-11-23
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Expires: 1995-02-24
Abstract
Abstract A discharge tube for a gaseous laser is terminated with windows made of crystalline quartz which do not fluoresce in the presence of high energy, visible and ultraviolet light radiation.
Inventors
- 👤 Ronald V. Alves
- 👤 Verne R. Costich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/02; H01S3/04; H01S3/041; H01S3/03; H01S3/032; H01S3/034
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
56 words
A laser comprising: a. a gaseous lasing medium; b. a discharge tube for enclosing said gaseous lasing medium; c. means for exciting said gaseous lasing medium; d. an optical resonator structure aligned with said discharge tube; and e. a pair of Brewster angle windows terminating the ends of said discharge tube, said windows comprising crystalline quartz.
Claim 2
Dependent Claim
56 words
A laser comprising: a. a gaseous lasing medium; b. a discharge tube for enclosing said gaseous lasing medium; c. means for exciting said gaseous lasing medium; d. an optical resonator structure aligned with said discharge tube; and e. a pair of Brewster angle windows terminating the ends of said discharge tube, said windows comprising crystalline quartz.
Claim 3
Dependent Claim
13 words
A laser as in claim 1 wherein said crystalline quartz is synthetically grown.
Claim 4
Dependent Claim
25 words
A laser as in claim 2 wherein said synthetically grown quartz includes low concentrations of impurities taken from the group comprising lithium, sodium and hydrogen.
Claim 5
Dependent Claim
42 words
In a laser having a laser medium, an optical resonator therewith, and means for exciting the laser medium, and having windows within the optical resonator cavity through which the laser beam passes and wherein the improvement comprises said windows comprising crystalline quartz.
Claim 6
Dependent Claim
42 words
In a laser having a laser medium, an optical resonator therewith, and means for exciting the laser medium, and having windows within the optical resonator cavity through which the laser beam passes and wherein the improvement comprises said windows comprising crystalline quartz.
Claim 7
Dependent Claim
17 words
A laser as in claim 4 wherein said crystalline quartz has low numbers and concentrations of imperfections.
Claim 8
Dependent Claim
13 words
A laser as in claim 5 wherein said crystalline quartz is synthetically grown.
Claim 9
Dependent Claim
14 words
A laser as in claim 6 wherein said crystalline quartz includes the impurity sodium.
Claim 10
Dependent Claim
17 words
A laser as in claim 7 wherein the sodium comprises approximately 2 to 9 parts per million.
Claim 11
Dependent Claim
14 words
A laser as in claim 6 wherein said crystalline quartz includes the impurity lithium.
Claim 12
Dependent Claim
17 words
A laser as in claim 9 wherein the lithium comprises approximately 1/2 to 1 parts per million.
Claim 13
Dependent Claim
14 words
A laser as in claim 6 wherein said crystalline quartz includes the impurity hydrogen.
Claim 14
Dependent Claim
17 words
A laser as in claim 11 wherein the hydrogen comprises approximately 5 to 20 parts per million.
Claim 15
Dependent Claim
17 words
A laser as in claim 6 wherein said crystalline quartz includes the impurities lithium, sodium and hydrogen.
Claim 16
Dependent Claim
38 words
A laser as in claim 13 wherein the lithium comprises approximately 1/2 to 1 parts per million, the sodium comprises approximately 2 to 9 parts per million, and the hydrogen comprises approximately 5 to 20 parts per million.
Claim 17
Dependent Claim
14 words
A laser as in claim 5 wherein said crystalline quartz includes the impurity sodium.
Claim 18
Dependent Claim
17 words
A laser as in claim 15 wherein the sodium comprises approximately 2 to 9 parts per million.
Claim 19
Dependent Claim
14 words
A laser as in claim 5 wherein said crystalline quartz includes the impurity lithium.
Claim 20
Dependent Claim
17 words
A laser as in claim 17 wherein the lithium comprises approximately 1/2 to 1 parts per million.
Claim 21
Dependent Claim
17 words
A laser as in claim 5 wherein said crystalline quartz includes the impurities lithium, sodium and hydrogen.
Claim 22
Dependent Claim
38 words
A laser as in claim 19 wherein the lithium comprises approximately 1/2 to 1 parts per million, the sodium comprises approximately 2 to 9 parts per million, and the hydrogen comprises approximately 5 to 20 parts per million.
Claim 23
Dependent Claim
67 words
A laser comprising: a. a gaseous lasing medium; b. a discharge tube for enclosing said gaseous lasing medium; c. means for exciting said gaseous lasing medium; d. an optical resonator structure aligned with said discharge tube; and e. a pair of Brewster angle windows terminating the ends of said discharge tube, said windows comprising quartz having an impurity taken from the group comprising lithium, sodium and hydrogen.
Claim 24
Dependent Claim
67 words
A laser comprising: a. a gaseous lasing medium; b. a discharge tube for enclosing said gaseous lasing medium; c. means for exciting said gaseous lasing medium; d. an optical resonator structure aligned with said discharge tube; and e. a pair of Brewster angle windows terminating the ends of said discharge tube, said windows comprising quartz having an impurity taken from the group comprising lithium, sodium and hydrogen.
Claim 25
Dependent Claim
11 words
A laser as in claim 21 wherein said impurity is lithium.
Claim 26
Dependent Claim
17 words
A laser as in claim 22 wherein said lithium comprises approximately 1/2 to 1 parts per million.
Claim 27
Dependent Claim
11 words
A laser as in claim 21 wherein said impurity is sodium.
Claim 28
Dependent Claim
17 words
A laser as in claim 24 wherein said sodium comprises approximately 2 to 9 parts per million.
Claim 29
Dependent Claim
14 words
A laser as in claim 21 wherein said impurity comprises lithium, sodium and hydrogen.
Claim 30
Dependent Claim
38 words
A laser as in claim 26 wherein said lithium comprises approximately 1/2 to 1 part per million, said sodium comprises approximately 2 to 9 parts per million, and said hydrogen comprises approximately 5 to 20 parts per million.
Claim 31
Independent Claim
43 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser resonator cavity comprising the step of inserting only light transmissive members comprising crystalline quartz within the resonator cavity.
Claim 32
Independent Claim
43 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser resonator cavity comprising the step of inserting only light transmissive members comprising crystalline quartz within the resonator cavity.
Claim 33
Independent Claim
58 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser resonator cavity comprising the steps of inserting within the cavity only light transmissive members comprising synthetically-grown crystalline quartz having low numbers and concentrations of imperfections and orienting said crystalline quartz to eliminate birefringence.
Claim 34
Independent Claim
58 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser resonator cavity comprising the steps of inserting within the cavity only light transmissive members comprising synthetically-grown crystalline quartz having low numbers and concentrations of imperfections and orienting said crystalline quartz to eliminate birefringence.
Claim 35
Dependent Claim
20 words
The method as in claim 29 wherein the imperfections comprise impurities taken from the group comprising lithium, sodium and hydrogen.
Claim 36
Independent Claim
52 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser comprising the step of inserting only light transmissive members comprising quartz doped with one, two or all impurities taken from the group comprising lithium, sodium, and hydrogen.
Claim 37
Independent Claim
52 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser comprising the step of inserting only light transmissive members comprising quartz doped with one, two or all impurities taken from the group comprising lithium, sodium, and hydrogen.
Claim 38
Independent Claim
53 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser comprising the step of inserting only light transmissive members comprising crystalline quartz doped with one, two or all impurities taken from the group comprising lithium, sodium and hydrogen.
Claim 39
Independent Claim
53 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member in a laser comprising the step of inserting only light transmissive members comprising crystalline quartz doped with one, two or all impurities taken from the group comprising lithium, sodium and hydrogen.
Claim 40
Independent Claim
70 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member comprising the step of inserting within the path of a linearly polarized laser beam a crystalline quartz, light transmissive member oriented with the optical axis of said crystalline quartz normal to the axis of polarization of such laser beam to eliminate the intrinsic birefringence of said crystalline quartz.
Claim 41
Independent Claim
70 words
A method of preventing red fluorescence caused by the passage of high power visible and ultraviolet light through a light transmissive member comprising the step of inserting within the path of a linearly polarized laser beam a crystalline quartz, light transmissive member oriented with the optical axis of said crystalline quartz normal to the axis of polarization of such laser beam to eliminate the intrinsic birefringence of said crystalline quartz.
Claim 42
Dependent Claim
20 words
A member as in claim 33 wherein said crystalline quartz is synthetically grown with low numbers and levels of imperfections.
Claim 43
Dependent Claim
24 words
A member as in claim 34 wherein said quartz includes one, two or all impurities taken from the group comprising lithium, sodium and hydrogen.
Claim 44
Dependent Claim
23 words
A member as in claim 33 wherein said quartz includes one, two or all impurities taken from the group comprising lithium and sodium.
References Cited (Backward Citations)
US3694768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |