| Project/Area Number |
12555105
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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 | 展開研究 |
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| Research Field |
電子デバイス・機器工学
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| Research Institution | RIKEN |
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Principal Investigator |
KAWASE Kodo Kawase Initiative Research Unit, Initiative Researcher, 川瀬独立主幹研究ユニット, 独立主幹研究員 (00296013)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Atsushi Tohoku Institute of Technology, Research Associate, 助手 (00322686)
MINAMIDE Hiroaki RIKEN, Tera-Photonics team, Frontier researcher, 光発生・計測研究チーム, フロンティア研究員 (10322687)
IMAI Kazuhiro RIKEN, Tera-Photonics team, Frontier researcher, 光発生・計測研究チーム, フロンティア研究員 (90322685)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,500,000 (Direct Cost: ¥13,500,000)
Fiscal Year 2001: ¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 2000: ¥7,600,000 (Direct Cost: ¥7,600,000)
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| Keywords | Terahertz-wave / parametric / widely tunable / nonlinear optics / injection seeding / テラヘルツ / LiNbO_3結晶 / THz波 |
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| Research Abstract |
We have researched a THz-wave parametric oscillator (TPO) and THz-wave parametric generator (TPG) based on the polariton mode scattering of MgO : LiNbO_3 crystals [2]. The TPO has proved to be a useful coherent THz-wave source that operates at room temperature. It is continuously tunable in the 100 to 300 μm (1 to 3 THz) range in one operation and can emit peak powers of up to several tenths mW. The difference between a TPO and a TPG is that the former has an idler cavity while the latter does not. The THz-wave linewidth of a conventional TPG exceeds 1 THz and the output is much smaller than that from a TPO. The TPG spectrum was narrowed to the Fourier transform limit of the pulsewidth by introducing an injection seeding to the idler. The THz-wave linewidth was dramatically sharpened from >1 THz to 100 MHz. A wide tunability from 0.7 to 2.4 THz (wavelength : 125 to 430 μm) was observed using an external cavity diode laser as an injection seeder. The continuous scanning and narrow spectral bandwidth of the is-TPG were verified in the absorption spectrum of low-pressure water vapor. Simultaneously, the output obtained was more stable than that from conventional TPG, TPO, and is-TPO. As far as we know, injection seeding to ns optical parametric generators (OPG) has not been reported until recently, due to the limit of parametric gain.
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