Patent US2928533A successfully refreshed from Google Patents.
US4027273A
Expired / Lapsed
US
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Compact pulsed laser having improved heat conductance
Assignee: National Aeronautics and Space Administration
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Filing: 1972-12-21
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Granted: 1977-05-31
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Expires: 1992-12-21
Abstract
Abstract A highly efficient, compact pulsed laser having high energy to weight and volume ratios is provided. The laser utilizes a cavity reflector that operates as a heat sink and is essentially characterized by having a high heat conductivity, by being a good electrical insulator and by being substantially immune to the deleterious effects of ultra-violet radiation. Manual portability is accomplished by eliminating entirely any need for a conventional circulating fluid cooling system.
Inventors
- 👤 Lien C. Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:39
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092; H01S3/02; H01S3/04; H01S3/042; H01S3/0405
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A compact, pulsed, manually-portable laser assembly comprising: a laser rod; a source of light energy positioned in close proximity to said laser rod for controllably irradiating said laser rod with pulsed light energy; and cooling means for effectively dissipating heat produced by said laser rod and said source of light energy, said cooling means consisting of a solid heat sink having a cavity in which said laser rod and source of light energy are housed, said heat sink being made of a material wherein both the heat conductance and resistivity characteristics thereof differ in a radial direction extending from the laser rod from such characteristics in a direction parallel to the axis of said laser rod, said heat produced in said cavity by said laser rod and said source of light energy being dissipated by said solid heat sink.
Claim 2
Dependent Claim
139 words
A compact, pulsed, manually-portable laser assembly comprising: a laser rod; a source of light energy positioned in close proximity to said laser rod for controllably irradiating said laser rod with pulsed light energy; and cooling means for effectively dissipating heat produced by said laser rod and said source of light energy, said cooling means consisting of a solid heat sink having a cavity in which said laser rod and source of light energy are housed, said heat sink being made of a material wherein both the heat conductance and resistivity characteristics thereof differ in a radial direction extending from the laser rod from such characteristics in a direction parallel to the axis of said laser rod, said heat produced in said cavity by said laser rod and said source of light energy being dissipated by said solid heat sink.
Claim 3
Dependent Claim
162 words
A compact, pulsed, manually-portable laser assembly comprising: a laser rod including a glass rod doped with neodymium oxide; a source of light energy positioned in close proximity to said laser rod for controllably irradiating said laser rod with pulsed light energy, said source of light energy being a helical flash lamp; and cooling means for effectively dissipating heat produced by said laser rod and said source of light energy, said cooling means consisting of a solid heat sink having a cavity in which said laser rod and source of light energy are housed, said heat sink being made with boron nitride having a heat conductance of approximately 0.28 watts cm/cm 2 K° and dielectric strength of approximately 3.8 × 10 4 volts/mm, said boron nitride being pressure molded to provide preferential directions for the thermal and resistivity characteristices thereof, said heat produced in said cavity by said laser rod and said source of light energy being dissipated by said solid heat sink.
Claim 4
Dependent Claim
162 words
A compact, pulsed, manually-portable laser assembly comprising: a laser rod including a glass rod doped with neodymium oxide; a source of light energy positioned in close proximity to said laser rod for controllably irradiating said laser rod with pulsed light energy, said source of light energy being a helical flash lamp; and cooling means for effectively dissipating heat produced by said laser rod and said source of light energy, said cooling means consisting of a solid heat sink having a cavity in which said laser rod and source of light energy are housed, said heat sink being made with boron nitride having a heat conductance of approximately 0.28 watts cm/cm 2 K° and dielectric strength of approximately 3.8 × 10 4 volts/mm, said boron nitride being pressure molded to provide preferential directions for the thermal and resistivity characteristices thereof, said heat produced in said cavity by said laser rod and said source of light energy being dissipated by said solid heat sink.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |