Experimental research on chaos in qusi-quantum systems using optical fibers
Project/Area Number |
03640354
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
物理学一般
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Research Institution | Keio university |
Principal Investigator |
YAMADA Koichi Keio university, Science and Technology, assistant professor, 理工学部, 専任講師 (40146577)
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Project Period (FY) |
1991 – 1992
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Project Status |
Completed (Fiscal Year 1992)
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Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
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Keywords | Chaos in quantum systems / Optical fiber / Phase-conjugation / ファイバー光伝播 / ファイバ-光伝播 |
Research Abstract |
1. Optical analog of a quantum system is realized using a multimode optical fiber. (1)Nearly one mode is excited by careful adjustments of optical systems. But it is impossible to excite only one higher-mode, because of an inhomogeneous distribution of refractive index in the fiber, which may due to the imperfection in manufacturing processes and fluctuating perturbations by small bends. (2)Dissipative processes are severe obstacles to realize a simple chaos in conservative systems. In our multimode fiber system. transitions from binding modes to continuous modes can be regarded as ionization processes if we think of the optical analog of a quantum system as an "atom", and they prevent a time-reversal experiment we intend to study. To eliminate the dissipative process, the perturbation by a micro-bend on a naked fiber is promising. 2. We analyzed a wave front of a phase-conjugation. whose original wave is developed in chaotic process. This is an optical analog of a time-reversal experiment in quantum chaotic systems. A randomness of the phase-conjugation wave front increases somewhat drastically at a certain intensity of the perturbation. while that of original wave front does gradually. The reflectivity of our conjugation mirror is about 1% and is very sensitive to the pump beam qualities such as spectral-width and beam pattern.
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Report
(3 results)
Research Products
(4 results)