US4751714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser system with improved gaseous raman scattering cell
Assignee: General Electric Co
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Filing: 1987-01-12
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Granted: 1988-06-14
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Expires: 2007-01-12
Abstract
Abstract A laser system having a gaseous Raman cell incorporate methane (CH 4 ) as the Raman scattering medium. The cell includes gaseous hydrogen to prevent deposition of carbonaceous material from decomposed methane on the windows of the Raman cell.
Inventors
- 👤 Da-Wun Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:50
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/1086
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
112 words
In a laser system comprising: (a) an optical cavity (b) a lasing element positioned in said cavity to generate a beam of coherent radiation at a first frequency, (c) a gaseous Raman cell containing a first gaseous medium for producing a Raman interaction with said beam of coherent radiation of a first frequency, said cell being positioned in said cavity to convert a portion of said coherent radiation of said first frequency to coherent radiation of a second frequency, (d) a second gaseous medium incorporated in said Raman cell to suppress deposition of a constituent of the gaseous Raman scattering medium in said cell caused by decomposition of the gaseous Raman medium.
Claim 2
Dependent Claim
112 words
In a laser system comprising: (a) an optical cavity (b) a lasing element positioned in said cavity to generate a beam of coherent radiation at a first frequency, (c) a gaseous Raman cell containing a first gaseous medium for producing a Raman interaction with said beam of coherent radiation of a first frequency, said cell being positioned in said cavity to convert a portion of said coherent radiation of said first frequency to coherent radiation of a second frequency, (d) a second gaseous medium incorporated in said Raman cell to suppress deposition of a constituent of the gaseous Raman scattering medium in said cell caused by decomposition of the gaseous Raman medium.
Claim 3
Dependent Claim
17 words
The laser system according to claim 1 wherein said Raman cell contains an organic gaseous Raman medium.
Claim 4
Dependent Claim
22 words
The laser system according to claim 2 including means for suppressing deposition of free carbon from said organic medium in said cell.
Claim 5
Dependent Claim
14 words
The laser system according to claim 3 wherein said Raman cell contains pressurized methane.
Claim 6
Dependent Claim
28 words
The laser system according to claim 1 wherein said suppressing means comprises a quantity of free gas of the sort formed during decomposition of the gaseous Raman medium.
Claim 7
Dependent Claim
18 words
The laser system according to claim 4 wherein said cell contains free gaseous hydrogen along with said methane.
Claim 8
Dependent Claim
30 words
The laser system according to claim 6 wherein the amount of free hydrogen is sufficient to maintain the decomposition and reformation reaction of said methane and its constituents in equilibrium.
Claim 9
Dependent Claim
66 words
The laser system according to claim 7 wherein the amount of free hydrogen at any given methane pressure and at any given temperature is adequate according to the following relationship: K.sub.T [P(CH.sub.4)]=[P(H.sub.2)].sup.2 to maintain the reactions in equilibrium; where: K T =the equilibrium constant for CH 4 at any given temperature, P(CH 4 )=the methane partial pressure, and P(H 2 )=the partial pressure of free hydrogen.
Claim 10
Dependent Claim
73 words
A Raman scattering cell comprising: (a) a cell housing, (b) windows at each end of the housing transparent to laser radiation, (c) a gaseous Raman scattering medium in said housing, (d) an additional different gaseous medium in said housing for suppressing deposition of decomposition constituents of the gaseous Raman medium in said housing and on said windows whereby said different gaseous medium recombines with the decomposition constituent to reform said gaseous Raman medium.
Claim 11
Dependent Claim
73 words
A Raman scattering cell comprising: (a) a cell housing, (b) windows at each end of the housing transparent to laser radiation, (c) a gaseous Raman scattering medium in said housing, (d) an additional different gaseous medium in said housing for suppressing deposition of decomposition constituents of the gaseous Raman medium in said housing and on said windows whereby said different gaseous medium recombines with the decomposition constituent to reform said gaseous Raman medium.
Claim 12
Dependent Claim
29 words
The Raman scattering cell according to claim 9 wherein said suppressing means comprises a quantity of free gas of the sort formed during decomposition of the gaseous Raman medium.
Claim 13
Dependent Claim
20 words
The Raman scattering cell according to claim 10 wherein the Raman medium is methane and said gaseous suppressant is hydrogen.
Claim 14
Dependent Claim
34 words
The Raman scattering cell according to claim 11 wherein the amount of free hydrogen is sufficient to maintain the decomposition and reformation reactions of methane in equilibrium thereby suppressing carbon deposition on said windows.
Claim 15
Dependent Claim
62 words
The Raman scattering cell according to claim 12 wherein the amount of free hydrogen at any given methane pressure is adequate to maintain the reactions in equilibrium according to the following relationship: K.sub.T [P(CH.sub.4)]=[P(H.sub.2)].sup.2, where K T =the equilibrium constant for CH 4 at any given temperature, P(CH 4 )=the methane partial pressure and P(H 2 )=the partial pressure of free hydrogen.
References Cited (Backward Citations)
US4327337A
Cited
US4599725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |