2017 Fiscal Year Final Research Report
Development of cavity-enhanced impulsive Raman spectroscopy
| 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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| 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 |
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| 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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| Free Research Field |
分析化学
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