| Project/Area Number |
16K14021
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Analytical chemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 共振器増強分光法 / ラマン散乱 / ラマン分光 / モード同期レーザー / 周波数安定化レーザー / 共振器増強分光 / 非線形光学 / 光共振器 / 気体分析 / インパルシブ誘導ラマン散乱 / レーザー |
|---|
| Outline of Final Research Achievements |
A novel approach for real-time detection of trace Raman-active molecules, called cavity-enhanced impulsive Raman spectroscopy, was developed. A mode-locked laser at a repetition rate of 1 GHz was successfully coupled with a newly-designed portable ring-type optical cavity. The coupling condition was stabilized by a Hansch-Couillaud system specifically constructed for our optical cavity. We found the output beam from the hydrogen-filled optical cavity had a spectrum including a signal corresponding to rotational Raman scattering from ortho-hydrogen, which implies the excitation of molecular coherence of hydrogen. A continuous-wave semiconductor laser to probe the molecular coherence was prepared and its frequency was stabilized to a frequency of a hyperfine structure for Cs atom.
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