Development of equipment for laser excitation to the long-lived state of positronium

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K14741
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: Okayama University
• Principal Investigator: Hara Hideaki 岡山大学, 異分野基礎科学研究所, 特別契約職員(助教) (70737311)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 素粒子実験 / 原子・分子物理 / 量子エレクトロニクス

Outline of Final Research Achievements

We obtained the knowledge about a second harmonic generator and an amplification of the fundamental wave by a fiber amplifier, which are necessary for the development of the excitation laser source of positronium. Regarding the second harmonic generator, we succeeded in achieving an output power close to the designed value. As for the fiber amplifier, we succeeded in achieving high amplification and low amplified spontaneous emission noise. In this research, we developed at a wavelength different from the required wavelength, but by changing the wavelength, it is possible to obtain the laser source required for the excitation experiment. We also conducted studies related to two-photon excitation.

Free Research Field

原子・分子・量子エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

光源開発は、異なる波長でも必要な技術・ノウハウが共通している。第二高調波発生に関しては、設計値と近い出力パワーを実現することができたので、今後他の波長でも同様の設計手法に従って実現するパワーを見積もることが可能になる。また、ファイバーアンプに関しては、高品質の空間モードをもつ高出力の光源が実現可能になるため、開発技術・ノウハウを得ることにより、今後の光源開発の可能性が広がる。