腔增强热里德伯原子光谱  

Cavity-enhanced spectra of hot Rydberg atoms

作　　者：王勤霞 王志辉 刘岩鑫[1,2] 管世军 何军 张鹏飞[1,2] 李刚[1,2] 张天才[1,2] Wang Qin-Xia;Wang Zhi-Hui;Liu Yan-Xin;Guan Shi-Jun;He Jun;Zhang Peng-Fei;Li Gang;Zhang Tian-Cai(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,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,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,极端光学省部共建协同创新中心,太原030006

出　　处：《物理学报》2023年第8期313-319,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:U21A6006,U21A20433,11974223,11974225,12104277,12104278);山西省“1331工程”重点学科建设基金资助的课题.

摘　　要：高精度里德伯原子光谱在研究里德伯原子间的相互作用、里德伯能级结构、电磁场的精密测量等方面具有重要的应用价值,里德伯原子光谱对比度、信噪比的提高和线宽的压窄是获得高灵敏测量的基础.本文通过理论和实验研究了腔增强的里德伯原子光谱,与自由空间的光谱相比实现了在光谱线宽不变情况下11.5倍的光谱对比度和信噪比的提高.其原因是在双光子共振处产生的电磁诱导透明和光泵浦效应会导致腔内原子对探测光吸收的减弱,提高了光学腔的阻抗匹配效率,从而使进入腔内的光强增大,因此提高了里德伯原子光谱的对比度和信噪比,提高的倍数取决于探测光穿过原子的透射率.预期通过优化铯原子温度,光谱的对比度和信噪比能够提高23倍.本工作为提高里德伯原子光谱的对比度和基于里德伯原子的精密测量灵敏度提供了参考.High-precision spectra of Rydberg atoms are of significance in studying the interaction between Rydberg atoms,the energy level structure of Rydberg atom,and the precision measurement of the electromagnetic field.To enhance the measurement sensitivity,it is necessary to achieve the high contrast,high signal-to-noise ratio,and narrow linewidth of the spectra of the Rydberg atoms.In this work,the cavity-enhanced spectra of Rydberg atoms are studied theoretically and experimentally.Comparing with the free-space spectra of Rydberg atoms,the contrast and the signal-to-noise ratio are enhanced by 11.5 times,with the linewidth unchanged.Under the condition of two-photon resonance,both the electro-magnetically induced transparency and the double-resonance optical-pumping process can suppress the absorption of the probe laser,thereby improving the impedance matching of the cavity.As the intracavity probe laser intensity turns stronger,the contrast and signal-to-noise ratio can be improved further,and the improvement depends on the transmission of the probe laser through the atom vapor.It is expected that the contrast and signal-to-noise ratio can be improved by a factor of 23 through optimizing the temperature of the cesium atom vapor.This work provides an important reference for improving the contrast of the spectra of Rydberg atoms and the sensitivity of Rydberg-based precision measurements.

关 键 词：里德伯原子 光学谐振腔 铯原子气室 阻抗匹配 

分 类 号：O562[理学—原子与分子物理]