室温下铯原子体系光学非互易调控实验研究  

Experimental research on optical nonreciprocal control of cesium atomic systems at room temperature

作　　者：张慧玲[1] 谢中柱[2] 郝佳瑞 房勇 ZHANG Huiling;XIE Zhongzhu;HAO Jiarui;FANG Yong(Department of Materials and Chemical Engineering,Taiyuan University,Taiyuan 030032,China;Department of Mechanical Electronic and Vehicle Engineering,Taiyuan University,Taiyuan 030032,China;School of Material Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,China)

机构地区：[1]太原学院材料与化学工程系,太原030032 [2]太原学院机电与车辆工程系,太原030032 [3]四川轻化工大学材料科学与工程学院,自贡643000

出　　处：《物理学报》2025年第6期95-101,共7页Acta Physica Sinica

摘　　要：无磁有源光学非互易器件,有助于在不使用外磁场的情况下构建针对弱信号的光信息处理网络.本文在铯原子气体中通过激光激发Λ型三能级原子结构,实验上实现了电磁诱导透明现象的非互易传输,得到的光信号隔离可用于构建无磁有源光学非互易器件.在简并跃迁能级条件下,通过调节探测光和耦合光功率以及失谐进行了室温下铯原子体系的光学非互易隔离比调控实验规律的研究,分析了可调参量对非互易隔离比的影响,得到的最大隔离比可达26 dB.为探索具有高隔离比的高性能非互易器件提供了一定的依据,为设计新一代光学设备提供了新思路.Non-magnetic optical non-reciprocal devices are conducive to constructing optical information processing networks for weak signals without using any external magnetic field.In this work,the non-reciprocal transmission of electromagnetically induced transparency(EIT)in a cesium atomic gas through laser exciting aΛ-type three-level atomic system is observed experimentally.With the help of cesium atoms,which have several advantages over other alkali atoms,such as a rich and readily adjustable energy level structure,bigger ground state hyperfine energy levels,and lower saturation light intensity.An 894.596 nm laser,as probe light,excites energy level from 6S_(1/2)(F=4)to 6P_(3/2)(F=5),and an 894.594 nm laser,as coupling light,is divided into two beams to excite energy level from 6S_(1/2)(F=3)to 6P_(3/2)(F=5).The coupling light enters the cesium atomic gas cell in two directions:either collinearly incident in the same direction as the probe light,or in the opposite direction.The probing light that interacts with the coupling light inside the cesium atomic gas and then is detected by the detector avalanche photodiode,and the outcomes are shown and measured on an oscilloscope.The experimentally observed non-reciprocal transmission of EIT proves optical signal isolation in a cesium atomic system.Under the experimental conditions,a series of experiments is conducted on the regulation of the optical non-reciprocal isolation ratio at room temperature by adjusting the power of the probe light and coupling light as well as the detuning.The influence of adjustable parameters on the non-reciprocal isolation ratio is analyzed.The results show that moderate probe light power helps maintain the intensity of EIT in the absorption intensity curve,ensuring a high isolation ratio,which provides a reference for implementing the performance metrics of optical isolators.The observed isolation ratio increases with the increase of coupling power,which is consistent with the theoretical calculation.Within a certain range of coupling light

关 键 词：铯原子体系 电磁诱导透明 光学非互易 

分 类 号：O43[机械工程—光学工程]