Generation of Coherent VUV Vortex beam by Synchrotron Radiation

2016 Fiscal Year Final Research Report

• Project/Area Number: 26286081
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Quantum beam science
• Research Institution: Institute for Molecular Science
• Principal Investigator: KATOH Masahiro 分子科学研究所, 極端紫外光研究施設, 教授 (30185871)
• Co-Investigator(Renkei-kenkyūsha): KONOMI Taro 高エネルギー加速器研究機構, 加速器研究施設, 助教 (20634158) ; HOSAKA Masahito 名古屋大学, シンクロトロン光研究センター, 准教授 (60290897) ; YAMAMOTO Naoto 名古屋大学, シンクロトロン光研究センター, 助教 (60377918) ; TAKASHIMA Yoshifumi 名古屋大学, シンクロトロン光研究センター, 教授 (40303664)
• Research Collaborator: FUJIMOTO Masaki ; SASAKI Shigemi ; MIRIAN Najmeh ; MOCHIHASHI Akira
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 加速器 / 放射光 / 角運動量 / コヒーレンス / 電磁波

Outline of Final Research Achievements

We succeeded in generating an optical vortex beam, which carries the orbital angular momentum from a diffraction-limited high energy electron beam passing through a circular polarization undulator. We have demonstrated that it has a spiral wave-front by interfering two spatially coherent optical vortex beams. We have demonstrated for the first time that a phase singularity exists at the beam center by a double-slit diffraction experiment. As the underlying physics of this phenomenon, we have shown theoretically for the first time that radiation from an electron in circular motion possesses a spiral wave-front and carries orbital angular momentum.

Free Research Field

ビーム物理学、加速器科学、量子ビーム科学