2014 Fiscal Year Final Research Report
Development of Circularly Polarized Light Source in the Terahertz-wave Region with Coherent Transition Radiation
| Project/Area Number |
24651099
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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 |
Quantum beam science
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 電子線型加速器 / 放射光 / 遷移放射 / コヒーレント / 円偏光 / テラヘルツ / ミリ波 |
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| Outline of Final Research Achievements |
For the spectroscopic purpose, various types of coherent radiation emitted from a relativistic electron beam have attracted a considerable attention as a new and powerful light source in the THz-wave region. Coherent transition radiation (CTR) is one of such a light source. Whereas synchrotron radiation has linear polarization along an electron orbit, the electric vector of transition radiation (TR) emitted from a metallic screen is axially symmetric with respect to the trajectory of an electron beam. Therefore, CTR is usually utilized as a non-polarized light source in the spectroscopic application. However, circularly polarized light has been useful in the circular dichroism spectroscopy. In this study a new technique of generation of circularly polarized THz radiation using two kinds of linearly polarized CTR with horizontal and vertical components. The polarization degree can be easily controlled by changing the phase difference between the two CTRs.
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| Free Research Field |
赤外放射光
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