Generation of photons carrying orbital angular momentum by nonlinear inverse Compton scattering

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H03477
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: Institute for Molecular Science (2020); National Institute of Advanced Industrial Science and Technology (2018-2019)
• Principal Investigator: Taira Yoshitaka 分子科学研究所, 極端紫外光研究施設, 准教授 (60635803)
• Co-Investigator(Kenkyū-buntansha): 神門 正城 国立研究開発法人量子科学技術研究開発機構, 関西光科学研究所 光量子科学研究部, グループリーダー(定常) (50343942)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 光渦 / ガンマ線渦 / 軌道角運動量 / トムソン散乱 / コンプトン散乱

Outline of Final Research Achievements

During this research period, we succeeded in detecting the helical wavefront of X-rays by diffraction from a triangular aperture for the first time in the world, and also demonstrated both theoretically and experimentally that it is possible to generate light with a phase structure in an elliptically polarized undulator. At the Kansai Photon Science Institute, we conducted experiments on the generation of gamma-ray vortices forming helical wavefronts by nonlinear inverse Compton scattering using an intense circularly polarized laser, but we were unable to measure the annular intensity distribution, which is a characteristic feature of gamma-ray vortices.

Free Research Field

量子ビーム科学

Academic Significance and Societal Importance of the Research Achievements

本研究では、ガンマ線渦の発生と計測手法確立のための研究開発を行ってきた。三角開口を用いたX線渦のらせん波面検出は、干渉法以外でらせん波面を検出できる最も簡便な方法である。楕円偏光アンジュレータを用いた光渦の発生方法は、位相構造を連続的に変化できる光を発生することが可能となり、円偏光レーザーを用いた非線形逆コンプトン散乱にも適用可能な技術である。