基于纳秒光脉冲激发的里德伯原子光谱  

Rydberg atomic spectroscopy based on nanosecond pulsed laser excitation

作　　者：蔡婷 何军[1,3] 刘智慧 刘瑶[1] 苏楠[1] 史鹏飞 靳刚 成永杰 王军民[1,3] CAI Ting;HE Jun;LIU Zhihui;LIU Yao;SU Nan;SHI Pengfei;JIN Gang;CHENG Yongjie;WANG Junmin(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]北京无线电计量测试研究所,北京100039 [3]山西大学,省部共建极端光学协同创新中心,太原030006

出　　处：《物理学报》2025年第1期125-132,共8页Acta Physica Sinica

摘　　要：通过852 nm连续激光和509 nm脉冲激光级联激发,在室温铯原子气室中实现了里德伯原子电磁诱导透明(EIT)光谱.509 nm纳秒激光脉冲功率~173 W,脉冲重复频率在300 kHz-100 MHz范围连续可调,脉宽在1-100 ns范围连续可调.实验研究了里德伯EIT光谱与509 nm脉冲激光参数的关系.时域周期脉冲光在频域上等效为相干频率梳,通过激光脉冲参数调节实现了可控速度群原子的里德伯态激发.基于光脉冲激发的原子干涉光谱具有高信噪比,在量子传感和量子模拟领域有潜在的应用价值.Through the cascade excitation of 852-nm continuous-wave(CW)laser and 509-nm nanosecond pulsed laser,the electromagnetically-induced transparency(EIT)spectroscopic signals of ladder-type three-level cesium atoms with Rydberg state are obtained by using a room-temperature cesium vapor cell.The power of 509-nm pulsed laser beam is~176 W,while the pulse repetition frequency ranges from 300 kHz to 100 MHz and can be continuously adjusted.The laser pulse duration runs from 1 to 100 ns and can be continuously adjusted.The relationship between Rydberg EIT spectroscopic signals and 509-nm nanosecond pulsed laser parameters is investigated experimentally.By changing the pulse repetition frequency and the pulse duration of the 509-nm nanosecond pulsed laser,the comb-like Rydberg atomic spectrum is obtained by using a room-temperature cesium vapor cell.Within a certain range of repetition frequency and pulse duration,the envelope of spectral lines shows a regular pattern,and the spacing between the transmission peaks is consistent with the pulse repetition frequency.By changing the 509-nm laser pulse repetition frequency and pulse duration,atoms with the specific velocity group can be excited to Rydberg state.Reducing the repetition frequency of the 509-nm pulsed coupling laser can further increase the number of atoms in the Rydberg state in comparison with the case of finite velocity group pumping of cesium atoms by a continuous-wave laser.When the repetition frequency of the 509-nm pulsed laser approaches the EIT linewidth,the number of cesium Rydberg atoms can be increased by up to 10 times.In the parameter optimization process,the dynamic characteristics of pulsed excitation in multi-level atoms,as well as the interaction characteristics between arbitrarily shaped laser pulses and multi-level atomic systems,should be considered.Pulsed laser pumping can achieve the interaction between the laser field and atomic group with a specific velocity,and its developed atomic frequency comb spectra can be used for electric and mag

关 键 词：里德伯原子 纳秒脉冲激光 电磁感应透明光谱 速度选择光谱 

分 类 号：O562.3[理学—原子与分子物理]