2022 Fiscal Year Final Research Report
Mode conversion of Laguerre Gaussian beam with radial mode by geometric transformation
Project/Area Number |
20K05364
|
Research Category |
Grant-in-Aid for Scientific Research (C)
|
Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 30020:Optical engineering and photon science-related
|
Research Institution | Kochi University of Technology |
Principal Investigator |
|
Project Period (FY) |
2020-04-01 – 2023-03-31
|
Keywords | ラゲールガウスビーム / 光渦 / 光の軌道角運動量 / 動径モード / 幾何学変換 / 空間位相変調器 |
Outline of Final Research Achievements |
Laguerre-Gaussian (LG) beams, which are light waves with orbital angular momentum (OAM), have potential applications in various fields. The LG beam has an azimuthal mode having OAM and a radial mode as another degree of freedom. In this study, we established a mode conversion technique of azimuthal and radial modes of LG beams using geometrical conversion. As a result of the research, the generation accuracy of the multiplication and division transformations of azimuthal mode was experimentally evaluated. Moreover, although the radial mode transformation could not be achieved by the originally proposed geometrical transformation, a new method using a ladder operator was proposed and we confirmed its function through numerical simulations.
|
Free Research Field |
特異光学、光計測、非線形光学、量子光学
|
Academic Significance and Societal Importance of the Research Achievements |
ラゲールガウス (LG)ビームは空間モード分割多重通信や微粒子の回転操作(光スパナ)、量子情報・量子通信分野への応用が積極的に研究されている。近年では光波だけではなくX線や電波、電子ビームなどでもLGモードの応用が研究されている。いずれの応用においてもモード変換は非常に重要な基盤技術である。本研究ではこれまで実現が難しかった方位角モードの逓倍・分周変換及び動径モード変換手法の提案をしており、より自由度の高いモード変換を利用した応用技術への貢献が見込まれる。
|