2010 Fiscal Year Final Research Report
Development of high power THz source using phase control technique
| Project/Area Number |
20340159
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Plasma science
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| Research Institution | Utsunomiya University |
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Principal Investigator |
YUGAMI Noboru Utsunomiya University, 工学研究科, 教授 (60220521)
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| Co-Investigator(Kenkyū-buntansha) |
HIGASHIGUCHI Takeshi 宇都宮大学, 工学研究科, 准教授 (80336289)
HANGYO Masanori 大阪大学, 工学研究科, 教授 (10144429)
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| Project Period (FY) |
2008 – 2010
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| Keywords | チャープ / テラヘルツ / 電離面 / DARC / フラッシュ電離 |
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| Research Abstract |
We have demonstrated that the phase-controlled terahertz radiation can be generate by the burst current produced by a laser created ionization front, which is induced an optical-field-induced ionization (OFI) in air with a pulsed electric field. The peak frequency of the radiation spectrum depends on the rise time of the OFI. The central frequencies of the radiation were observed to be 0.3 and 0.1 THz at the pulse durations of 30 and 100 fs (FWHM), respectively. We also have demonstrated the proof-of-principle experiment of flash ionization scheme using the interaction between a terahertz wave and plasmas created by an ultrashort laser pulse. When plasmas were instantaneously created around an electromagnetic wave, frequency of the wave up-converted to the frequency, which depended on the plasma frequency. We observed frequency up-conversion from 0.35 THz to 3 THz by the irradiance of the laser in ZnSe crystal.
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[Presentation] 超短パルスレーザー誘起放電大気プラズマからのテラヘルツ放射特性2010
Author(s)
東口武史,柏崎宏明,大塚崇光,宮澤準,大場貴文,鈴木光騎,湯上登,千徳靖彦,兒玉了祐
Organizer
2010年秋季 第71回応用物理学会学術講演会,16p-F-11,
Place of Presentation
長崎大学文教キャンパス(長崎県長崎市)
Year and Date
2010-09-16
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