1986 Fiscal Year Final Research Report Summary
Deve lopment of the TEA <CO_2> laser-pumped Submillimeter laser for ion temper ature measurement in high temperature plasma
| Project/Area Number |
60850012
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
物理計測・光学
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| Research Institution | Kyushu University |
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Principal Investigator |
OKADA Tatsuo Faculty of Engineering, Kyushu University, 工学部, 助教授 (90127994)
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| Co-Investigator(Kenkyū-buntansha) |
HONDA Chikahisa Faculty of Engineering, Kyushu University, 工学部, 助手 (20037881)
UCHINO Kiichirou Graduate School of Engineering Sciences, Kyushu University, 総合理工学研究科, 助教授 (10160285)
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| Project Period (FY) |
1985 – 1986
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| Keywords | thermonuclear fusion / ion temperature / Thomson scattering / <CO_2> laser / submillimeter laser / injection-locking |
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| Research Abstract |
In order to perform the collective Thomson-scattering measurements of ion temperature of plasmas of thermonuclear interest, a high-power ( 1MW), narrow-band ( 100 MHz) and long-pulse (several hundreds ns) submillimeter laser is required. For the purpose, a <D_2O> laser pumped by a single-mode TEA <CO_2> laser has been developed. In a last few years, we have been mainly developing a single-mode TEA <CO_2> laser system based on an injection-locked scheme. The aim of this project is to develop a narrow-band <D_2O> submillimeter laser with an output-power of 100 mJ and a pulse duration of several hundreds of ns, with which the scattering experiment becomes possible against a high density laboratory plasma.
Main results are as follows. (1) A single-mode TEA <CO_2> laser with an output-power of 30 J and a pulse-width of 1 s was developed based on an injection-locked scheme. (2) An output-energy of 120 mJ with a pulse-width of 800 ns and a spectral-width of less than 100 MHz was obtained from an unstable <D_2O> laser pumped by the <CO_2> laser.
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