| Project/Area Number |
07455030
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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 |
Applied optics/Quantum optical engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
ITO Hiromasa Tohoku University, Research Institute of Electrical Communication, Professor, 電気通信研究所, 教授 (20006274)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Manabu Tohoku University, Research Institute of Electrical Communication, Research Asso, 電気通信研究所, 助手 (50226007)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥7,700,000 (Direct Cost: ¥7,700,000)
Fiscal Year 1997: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | Frequency-shifted feedback / frequency chirp / solid-state laser / reflectometry / 周波数シフト / 固体レーザー / チャープ / モード / 周波数変調 / コヒーレンス / 光計測 |
|---|
| Research Abstract |
In this research project, oscillation mechanisms and applications a fuzzy mode laser was extensively investigated.
As to the oscillation mechanisms, we clarified for the first time that an output of the fuzzy mode laser consists of a chirped frequency comb. The chirped frequency comb has unique properties such as (a) ultra fast chirp rate (>200 PHz/s), (b) high frequency chirp linearity, and (c) highly phasecorrelated comb components. A theoretical analysis of the fuzzy mode laser was also carried out and it could explain well the oscillation mechanisms of the fuzzy mode laser.
A potential application of the fuzzy mode laser is an optical frequency domain reflectometry (OFDR). In this reseach project, we establishied a basis needed to realize the long distance, high accuracy OFDR by the fuzzy mode laser. In the experiment, a spatial accuracy of 50 mum was obtained at the distance of 4km.
In conclusion, this research clarified the oscillation mechanisms of the fuzzy mode laser, and an application of OFDR was successfully demonstrated.
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