外磁场作用下85Rb原子暗共振效应的研究  

Dark Resonance Effect of 85Rb Atoms with Magnetic Field

作　　者：李志鹏 燕阳 张恒飞 王三丹 元晋鹏[1,2] 汪丽蓉 LI Zhi-peng;YAN Yang;ZHANG Heng-fei;WANG San-dan;YUAN Jin-peng;WANG Li-rong(State Key Laboratory of Quantum Optics and Optical Quantum Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan,030006,China;Collaborative Innovation Center for Extreme Optics,Shanxi University,Taiyuan,030006,China)

机构地区：[1]山西大学激光光谱研究所量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学,极端光学协同创新中心,山西太原030006

出　　处：《量子光学学报》2024年第4期38-45,共8页Journal of Quantum Optics

基　　金：国家自然科学基金(62075121);山西省回国留学人员科研资助项目(2024-003);山西省2023年度留学人员科技活动项目择优资助(2023001);国家资助博士后研究人员计划(GZC20231510);山西省“1331工程”重点学科建设计划。

摘　　要：本文主要研究了^(85)Rb原子在外磁场作用下由于磁诱导跃迁产生的暗共振效应。在^(85)Rb原子Λ型能级系统中,根据理论计算在不同磁场强度下^(85)Rb原子磁子能级间的跃迁概率结果,实验中选取耦合光输出频率对应于5S_(1/2)(F_(g)=2,m_(F)=0)-5P_(3/2)(F_(e)=1,m_(F)=-1)磁子能级跃迁,探测光输出频率在5S_(1/2)(F_(g)=3)-5P_(3/2)(F_(e)=1)超精细结构跃迁附近扫描,在外磁场作用下观察到^(85)Rb原子的暗共振效应。当外磁场强度从900 G逐渐增加到1 200 G时,对应的暗共振信号峰值位置频移了约1.11 GHz,与利用密度矩阵理论获得的计算结果吻合很好。外磁场作用下原子暗共振效应的研究对于实现远离原子共振跃迁位置的激光频率大范围调谐锁定具有重要意义。Objective The investigation of light-matter interaction through quantum control technology stands as a primary research focus in the field of atomic and molecular photon physics.Electromagnetically induced transparency(EIT)is a significant quantum interference phenomenon with crucial applications in optical deceleration,optical bistability,non-inversion lasers,and quantum information.Compared with the transition between atomic hyperfine energy levels,the magnetically induced transition(MIT)between atomic magneton energy levels can be regulated by the external magnetic field.The dark resonance signal with wide range and tunable narrow linewidth is obtained by changing the intensity of the external magnetic field and the frequency detuning of coupling laser,which is of great significance for wide-ranging laser frequency tuning and locking applications.Methods The dark resonance effect is investigated through the magnetically induced transitions of ^(85)Rb atoms with the externalmagnetic field based on the Λ-type energy level system of the D2 line. Theoretically, the relationship between the transition probabilityof different magnetically induced transitions and the magnetic field is calculated. Meanwhile, the dark resonance signalpeak frequency with the magnetic field is obtained by calculating the density matrix. In the experiment, the probe laser is scannednear the transition frequency of 5S_(1/2) (F_(g)=3)-5P_(3/2) (F_(e)=1) with σ^(-) circularly polarization, while the coupling laser is resonant at 5S_(1/2) (F_(g)=2, m_(F)=0)-5P_(3/2) (F_(e)=1, m_(F) =-1) transition with σ^(-) circularly polarization. Finally, the magnetically induced transitions of ^(85)Rb atoms 5S_(1/2) (F_(g)=3, m_(F)=0)-5P_(3/2) (F_(e)=1, m_(F) =-1) is excited under the magnetic field.Results and Discussions The dark resonance signal peak corresponding to the magnetically induced transitions of ^(85)Rb atoms isobtained when the magnetic field is 900 G, which is consistent with theoretical results. The dark resonance signal peak frequency

关 键 词：磁场 磁子能级 磁诱导跃迁 暗共振效应 

分 类 号：O433.4[机械工程—光学工程]