Superradiance from cold Rydberg atoms as a new THz wave source

2015 Fiscal Year Final Research Report

• Project/Area Number: 26800215
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Institute of Physical and Chemical Research (2015); Aoyama Gakuin University (2014)
• Principal Investigator: Takamine Aiko 国立研究開発法人理化学研究所, 仁科加速器研究センター, 研究員 (10462699)
• Research Collaborator: MAEDA Haruka 青山学院大学, 理工学部, 教授 (80260199) ; SHIOZUKA Riki ; TAKANO Masayuki
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: リュードベリ原子 / 超放射 / テラヘルツ波 / 冷却原子

Outline of Final Research Achievements

Due to the high transition probabilities to the neighboring states, highly excited Rydberg atoms emit a superradiacne radiation including a THz wave which has recently attracted much attention. Superradiance has been hard to observe in a cold Rydberg atoms, due to the mode-matching within a nonuniformly distributed atomic sample and strong atomic interactions. However, in the preceding study, the researchers observed the evidence of superradiance in a cold Rydberg Rb gas under the conditions which did not satisfy the Dicke condition. In order to systematically study a wide range of the mode-matching conditions, the improved optical system for laser trapping made larger cold Rb atoms than the previous ones and the optical system for the Rydberg excitation laser of a much higher power was designed.

Free Research Field

原子・原子核物理