Coherent light generators – Particular active media – Insulating crystal
Patent
1989-02-03
1990-08-14
Gonzalez, Frank
Coherent light generators
Particular active media
Insulating crystal
372 42, 423446, H01S 316
Patent
active
049493477
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.times.10.sup.17 to 8.5 10.sup.19 atoms/cm.sup.3, subjecting this synthetic diamond to an electron irradiation with a dose of not less than 5.times.10.sup.17 electrons/cm.sup.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.degree. to 1850.degree. 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.
REFERENCES:
patent: 3970960 (1976-07-01), Mollenauer
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patent: 4174380 (1979-11-01), Strong et al.
patent: 4638484 (1987-01-01), Rand et al.
patent: 4880613 (1989-11-01), Satoh et al.
"Visible Color-Center Laser in Diamond", by S. C. Rand et al., Optics Letters, vol. 10, pp. 481 to 483, Oct. 1985.
"Optical Absorption and Luminescence in Diamond", by J. Walker Rep. Prog. Phys., vol. 42, 1979, p. 1979.
Nakashima Takeru
Satoh Shuichi
Tsuji Kazuwo
Fasse W. G.
Gonzalez Frank
Kane, Jr. D. H.
Sumitomo Electric Industries Ltd.
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