2016 Fiscal Year Final Research Report
Study on photoexcitation, novel plasma spectroscopy, and plasma control method using optical vortex
| Project/Area Number |
25287152
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Plasma science
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| Research Institution | Nihon University (2014-2016)
Nagoya University (2013) |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
戸田 泰則 北海道大学, 工学(系)研究科(研究院), 教授 (00313106)
吉村 信次 核融合科学研究所, 大学共同利用機関等の部局等, 准教授 (50311204)
寺坂 健一郎 九州大学, 総合理工学研究科(研究院), 助教 (50597127)
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| Co-Investigator(Renkei-kenkyūsha) |
ITO Kiyokazu 広島大学, 先端物質科学研究科, 助教 (70335719)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 光渦 / プラズマ分光 / ラゲールガウスビーム / 横ドップラーシフト |
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| Outline of Final Research Achievements |
Optical vortex (OV) beams are a set of solutions of the paraxial Helmholtz equation in the cylindrical coordinates, and its wave front has a spiral shape. The observer in the OV beam feels the three-dimensional Doppler effect, since the OV beam has the three-dimensional spiral wave front. In this study, spectroscopy methods which have the sensitivity to the beam crossing gas flow have been developed. Using the optical vortex spectroscopy methods, the beam-crossing gas flow was successfully detected as the transverse Doppler shift of the Doppler absorption spectrum and the Lamb dip shift of the saturated absorption spectrum, respectively. The dependence of the transverse Doppler shift on the distance from the phase singularity qualitatively agrees with the theory, however, the further improvement in accuracy of the transverse Doppler shift detection is required for the quantitative evaluation.
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| Free Research Field |
プラズマ理工学，プラズマ分光
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