Study on Random Lasers Utilizing Super Diffusion of Light

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560048
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied optics/Quantum optical engineering
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: OKAMOTO TAKASHI 九州工業大学, 大学院情報工学研究院, 教授 (40204036)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ランダムレーザー / 光散乱 / 超拡散 / ランダム媒質 / モンテカルロ法 / 時間領域差分法 / 光硬化性樹脂

Outline of Final Research Achievements

Random lasers have not been in practical use because of their low emission efficiencies. To improve the lasing efficiency, we have introduced a medium structure in which super-diffusive transport of light occurs. It is shown that introduction of spacer particles in appropriate conditions results in quasi-super-diffusive (QSD) random media. An electromagnetic simulation reveals the features of the intensity distribution inside the laser media and the spectrum of emitted light in QSD media. An increase of spectral peak intensity is observed experimentally for QSD media, indicating the possibility of improving the lasing efficiency by changing the light transport properties of random laser media.

Free Research Field

光物理学