Coherent controll in atomic fine structure states by intense THz pulses

Research Project

Project/Area Number	15K17806
Research Category	Grant-in-Aid for Young Scientists (B)
Allocation Type	Multi-year Fund
Research Field	Physical chemistry
Research Institution	Aoyama Gakuin University
Principal Investigator	Kitano Kenta 青山学院大学, 理工学部, 助教 (90586900)
Project Period (FY)	2015-04-01 – 2017-03-31
Project Status	Completed (Fiscal Year 2016)
Budget Amount *help	¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000) Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000) Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords	テラヘルツ / プラズマ / スピンフリップ
Outline of Final Research Achievements	THz time-domain spectroscopy has been widely applied to measure free electron density and collision rates of various types of plasma. We have applied the method to a laser induced plasma in a gas cell. A two color dye laser was introduced into the gas cell filled with Rb atoms, and the Rb atoms were ionized through multi-photon ionization process. After the excitation by the laser pulses, a THz pulse is coaxially introduced into the gas cell, and the electron density was successfully measured. By scanning the excitation wavelength of the laser pulse, we have also succeeded in the spectroscopy of Rydberg states of Rb atoms.