Rydberg原子nS_(1/2)→(n+1)S_(1/2)双光子激发EIT-AT光谱  

nS_(1/2)→(n+1)S_(1/2) two-photon excitation EIT-AT spectrum of Rydberg atom

作　　者：薛咏梅 郝丽萍[1] 樊佳蓓 焦月春[1,2] 赵建明 Xue Yong-Mei;Hao Li-Ping;Fan Jia-Bei;Jiao Yue-Chun;Zhao Jian-Ming(Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of 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,太原030006 [2]山西大学极端光学协同创新中心,太原030006

出　　处：《物理学报》2022年第4期65-70,共6页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2017YFA0304203);国家自然科学基金(批准号:62175136,11804202,61835007,12120101004);长江学者和创新团队发展计划(批准号:RTIRT_17R70);山西省“1331工程”重点学科建设计划资助的课题。

摘　　要：主要研究了热原子蒸气池中铯Rydberg原子nS_(1/2)→(n+1)S_(1/2)微波耦合的双光子光谱.铯原子基态(6S_(1/2))、第一激发态(6P_(3/2))、Rydberg态(69S_(1/2))形成阶梯型三能级系统,弱探测光作用于基态到激发态6S_(1/2)→6P_(3/2)的跃迁,强耦合光则作用于6P_(3/2)→69S_(1/2)的Rydberg跃迁形成电磁感应透明(EIT)效应,实现对Rydberg原子的光学探测.频率fMW=11.735 GHz的微波场耦合69S_(1/2)→70S_(1/2)的Rydberg跃迁,形成微波双光子光谱.利用EIT-AT分裂光谱研究微波电场强度对双光子光谱的影响.研究表明:在强微波场作用时,EIT-AT分裂与微波场功率成正比,而弱微波场时的EIT-AT分裂与微波场功率成非线性依赖关系,理论计算与实验测量结果相一致.本文的研究对微波电场的精密测量具有一定的指导意义.In this work,we present an nS_(1/2)→(n+1)S_(1/2) two-photon excitation EIT-AT spectrum of Rydberg atom in the vapor cell.A ground state(6S_(1/2)),a first excited state(6P_(3/2))and Rydberg state(69S_(1/2))of cesium atoms constitute a three-level system.A weak probe laser locking to the transition of 6S_(1/2)(F=4)→6P_(3/2)(F′=5)couples the ground-state transition,and the strong coupling laser drives the Rydberg transition of 6P_(3/2)→69S_(1/2) to yield electromagnetically induced transparency(EIT)effect,which realizes the optical detection of Rydberg atoms.Two Rydberg 69S_(1/2) and 70S_(1/2) levels are coupled with the microwave field at a frequency of fMW=11.735 GHz,forming a microwave two-photon spectrum.To observe the influence of microwave electric field power on two-photon spectrum,we investigate the microwave coupled Rydberg EIT-AT spectra at different microwave fields.The measurements show that the EIT-AT splitting interval is proportional to the square of the microwave electric field at strong microwave field,and indicvates a nonlinear dependence at weak microwave electric field.The theoretical calculation accords with the experimental measurement.The work here is of significance in precisely measuring the microwave electric field.

关 键 词：RYDBERG原子 微波场 EIT-AT 双光子光谱 

分 类 号：O562[理学—原子与分子物理] O433[理学—物理]