2009 Fiscal Year Final Research Report
Characterization of Random Lasers with Fractal Structures
| Project/Area Number |
19560035
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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 |
Applied optics/Quantum optical engineering
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
OKAMOTO Takashi Kyushu Institute of Technology, 大学院・情報工学研究院, 教授 (40204036)
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| Project Period (FY) |
2007 – 2009
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| Keywords | ランダムレーザー / フラクタル / レーザースペックル / 光硬化性樹脂 / 時間領域差分法 |
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| Research Abstract |
Random lasers, which have properties of both a conventional laser and an illuminating light source, have not been in practical use because of their low emission efficiencies. We introduced a self-similar (fractal) structure for a random laser medium to improve the efficiency. The statistical properties of three-dimensional intensity distributions formed with fractal speckle patterns have been elucidated. An electromagnetic simulation has shown that the fractal structures are suitable for random lasing. Experiments using a photopolymer indicated that a random laser can be fabricated by illuminating a polymer medium with laser speckles.
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