US4949347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond laser, method for producing the same, and method for activating such a laser
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1989-02-03
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Granted: 1990-08-14
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Expires: 2009-02-03
Abstract
Abstract A diamond laser formed of a synthetic diamond provides a high output power and a variable wavelength in the near infrared region. The maximum value of the optical density of H2 centers in the direction of the pumping light is in the range of 0.01 to 4. Laser action is caused in the range of 1000 to 1400 nm by an external pumping light at 650 to 950 nm. Such a diamond laser is produced by preparing a synthetic Ib type diamond having a nitrogen concentration within the range of 1×10 17 to 8.5 10 19 atoms/cm 3 , subjecting this synthetic diamond to an electron irradiation with a dose of not less than 5×10 17 electrons/cm 2 , and heat-treating the synthetic diamond in a vacuum of not more than 1 Torr or in an inert gas atmosphere and at a temperature within the range of 1400° to 1850° C. If the threshold value of the pumping light intensity necessary for causing laser action is Ith then, to make the pumping light intensity I greater than Ith throughout the laser crystal, it is important, that the maximum value of the optical density of H2 is within the range between 0.01 and 4.
Inventors
- 👤 Shuichi Satoh
- 👤 Kazuwo Tsuji
- 👤 Takeru Nakashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:35
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/14; H01S3/16; C; C30; C30B; C30B29/00; C30B29/02; C30B29/04; C30B33/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
57 words
A laser emitting synthetic diamond, comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm.
Claim 2
Dependent Claim
57 words
A laser emitting synthetic diamond, comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm.
Claim 3
Independent Claim
153 words
A method for producing H2 centers in a synthetic diamond for a laser emission, said synthetic diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) selecting said synthetic diamond as an Ib-type to have a nitrogen concentration within the range of 1×10 17 to 8.5×10 19 atoms/cm 3 , (b) subjecting said synthetic Ib-type diamond to an electron irradiation with a dose of not less than 5×10 17 electrons/cm 2 , and (c) heat-treating said synthetic Ib-type diamond in a temperature range of 1400° to 1850° C. in a vacuum of not more than 1 Torr, or in an inert gas atmosphere.
Claim 4
Independent Claim
153 words
A method for producing H2 centers in a synthetic diamond for a laser emission, said synthetic diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) selecting said synthetic diamond as an Ib-type to have a nitrogen concentration within the range of 1×10 17 to 8.5×10 19 atoms/cm 3 , (b) subjecting said synthetic Ib-type diamond to an electron irradiation with a dose of not less than 5×10 17 electrons/cm 2 , and (c) heat-treating said synthetic Ib-type diamond in a temperature range of 1400° to 1850° C. in a vacuum of not more than 1 Torr, or in an inert gas atmosphere.
Claim 5
Independent Claim
145 words
A method for producing H2 centers in a synthetic diamond for a laser emission, said synthetic diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) selecting said synthetic diamond as an Ib-type to have a nitrogen concentration within the range of 1×10 17 to 8.5×10 19 atoms/cm 3 , (b) subjecting said type Ib diamond to electron irradiation with a dose of not less than 5×10 17 electrons/cm 2 , and (c) heat-treating said synthetic diamond under ultrahigh pressure not less than 3.0 GPa and at a high temperature not less than 1500° C.
Claim 6
Independent Claim
145 words
A method for producing H2 centers in a synthetic diamond for a laser emission, said synthetic diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) selecting said synthetic diamond as an Ib-type to have a nitrogen concentration within the range of 1×10 17 to 8.5×10 19 atoms/cm 3 , (b) subjecting said type Ib diamond to electron irradiation with a dose of not less than 5×10 17 electrons/cm 2 , and (c) heat-treating said synthetic diamond under ultrahigh pressure not less than 3.0 GPa and at a high temperature not less than 1500° C.
Claim 7
Independent Claim
96 words
A method of controlling a laser emission of a laser emitting diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) exposing said laser emitting diamond to said external laser pumping light, and (b) varying a laser wavelength in the range of 1000 to 1400 nm.
Claim 8
Independent Claim
96 words
A method of controlling a laser emission of a laser emitting diamond comprising H2 centers with a maximum optical density in the direction of a pumping light within the range of 0.01 to 4 and a lasing ability in the range of 1000 to 1400 nm in response to an external pumping light having a wavelength within the range of 650 to 950 nm, said method comprising the steps of: (a) exposing said laser emitting diamond to said external laser pumping light, and (b) varying a laser wavelength in the range of 1000 to 1400 nm.
Claim 9
Dependent Claim
21 words
The method of claim 4, comprising the step of producing said external pumping light by means of a single semiconductor laser.
Claim 10
Dependent Claim
22 words
The method of claim 4, comprising the step of producing said external pumping light by means of a plurality of semicondutor lasers.
Claim 11
Dependent Claim
18 words
The method of claim 6, comprising the step of arranging said plurality of semiconductor lasers in an array.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |