| Project/Area Number |
10640383
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | Toyama University |
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Principal Investigator |
ODASHIMA Hitoshi Toyama University, Department of Physics, Associate Professor, 理学部, 助教授 (50233557)
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| Co-Investigator(Kenkyū-buntansha) |
TSUNEKAWA Shozo Toyama University, Department of Physics, Professor, 理学部, 教授 (40018982)
MATSUSHIMA Fusakazu Toyama University, Department of Physics, Associate Professor, 理学部, 助教授 (40142236)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1998: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | MIM diode / terahertz radiation / far-infrared radiation / difference frequency generation / molecular spectroscopy |
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| Research Abstract |
In this research, we generated terahertz (far-infrared) radiation over 6 THz by mixing radiation from a ィイD115ィエD1 NHィイD23ィエD2 laser and a COィイD22ィエD2 laser in a metal-insulator-metal diode. A ィイD115ィエD1NHィイD23ィエD2 laser and a COィイD22ィエD2 laser to pump it were designed and constructed. A feedback system for stabilization of a ィイD115ィエD1NHィイD23ィエD2 laser was also designed and made up. The ィイD115ィエD1NHィイD23ィエD2 laser was locked to a saturated absorption signal from low pressure of ィイD115ィエD1NHィイD23ィエD2 gas, and its frequencies were measured by heterodyning the ィイD115ィエD1NHィイD23ィエD2 laser against COィイD22ィエD2 lasers.
This ィイD115ィエD1NHィイD23ィエD2 laser was combined with a COィイD22ィエD2 laser constructed previously for difference frequency generation. Generation of far-infrared radiation was confirmed by observing spectra of CHィイD23ィエD2OH which has rich torsion-rotation transitions over 6 THz. We succeeded in the observation of a spectrum at 9 THz. Using this far-infrared radiation, 8 transitions of HF, HィイD135ィエD1C1, HィイD137ィエD1C1 were observed in the 6 to 9 THz region.
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