2001 Fiscal Year Final Research Report Summary
Basic research for realization of an unidirectional optical amplifier
| Project/Area Number |
12650340
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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 | Kanazawa University |
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Principal Investigator |
YAMADA Minoru Kanazawa University, Faculty of Engineering, Professor, 工学部, 教授 (80110609)
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| Co-Investigator(Kenkyū-buntansha) |
KUWAMURA Yuji Kanazawa University, Faculty of Engineering, Assistant Professor, 工学部, 講師 (10195612)
NAYYER Jamshid Kanazawa University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50313698)
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| Project Period (FY) |
2000 – 2001
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| Keywords | unidirectional optical amplifir / optical amplifier / electron beam / free electron laser / Cherenkov maser / non-reversidle device / ultra wide range / vacuum |
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| Research Abstract |
Any active device which can amplify and transfer the signal in single direction has not been invented yet. Subject of this research was to realize a unidirectional optical amplifier by utilizing an electron beam which is emitted in vacuum environment.
The propagation speed of the optical light in an dielectric wave-guide is slower than that in the free space, because the optical wave-guide has the refractive index. The optical light propagating by the dielectric wave-guide partly penetrates into the environmental space. When an electron beam is radiated along surface of the wave-guide and whose velocity coincides with the propagating speed of the optical light, energy of the electron beam can transfer to the optical light. That is, the optical light is amplified by the electron beam. Other component of the optical light which propagates counter direction is never amplified because the propagation speed is extremely. Another condition to amplify the optical light is the light should has
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an electric component in the direction of the radiated electron beam. Then the TM components of the light can be amplified. Mentioned above is the mechanism of our proposed unidirectional optical amplifier.
We had already being constructed an experimental set basing on a vacuum system toward this subject before this financial support was supported. We purchased an electron lens in 2000 by this financial support to make stronger focusing of the electron beam. We also improved structure of the dielectric wave-guide by attaching electrodes to release charged electron on surface of the wave-guide, until when measuring of the output light had been so much unstable. As the result, we observed enhancing of the guided optical light in wave-guide whose core layer wa made with evaporated a-Si film. We are expecting this enhancing should be the phenomenon which we has proposing as the amplification because characteristics of TM components for varying the acceleration voltage of the electron beam is well coincide with our theoretical calculation. However, we are still investigating details of the characteristics, because TE components were also enhanced in experiment. This unexpected phenomena may be caused by optical absorption and emission by the dielectric material itself.
We also started the experiment by applying the SOI substrate as the wave-guide and fabrication of a wave-guide for the input port in the amplifier. However, we have not got suitable data on these advanced experiments. Less
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