| Project/Area Number |
12650354
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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 |
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, Initiatve Research, 川瀬独立主幹研究ユニット, 独立主幹研究員 (00296013)
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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 |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Terahertz-gave / Nonlinear Optics / Organic nonlinear crystal / Difference frequency generation / Widely tunable / 非線形光学 / テラヘルツ / 擬似位相整合 / パラメトリック / THz波 / 差周波混合 / 広帯域波長可変 / DAST結晶 |
|---|
| Research Abstract |
A dual signal-wave quasi-phase-matched optical parametric oscillator was successfully demonstrated by use of periodically poled LiNbO_3 with cascade gratings. A compact THz-wave or far-infrared source was realized by difference frequency generation in DAST crystal using the DSW-QPM-OPO as a source. Since it is possible to vary the two signal wavelengths widely, a broad tuning range in the THz region is easily obtained. A PPLN with two periods on a pump-path has two energy conservation and phase matching conditions, so that one pump-wave can generate two signal-waves. We applied this light source to THz-wave difference frequency generation usilng a highly efficient organic ionic salt crystal of 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) which we grew. The incident beams were focused by a lens (f=100mm) on a spot about 0.5mmφ in size. The THz-wave generated was monitored with a 4K Si-bolometer. The typical THz-wave output was 10fJ/pulse. The THz wavelength was measured using a scanning Fabry-Perot etalon consisting of two metal mesh plates. The polarization direction of the THz-wave was shown to be parallel to the a-axis of the crystal by using a wire grid polarizer.
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