基于瞬态效应的原子跃迁操控  

Manipulating the Evolution of Atomic Transient Coherent Effect

作　　者：李一茁 孙宇杰 王兆英 LI Yi-zhuo;SUN Yu-jie;WANG Zhao-ying(Zhejiang Province Key Laboratory of Quantum Technology and Device,Department of Physics,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学物理系浙江省量子技术与器件重点实验室,杭州310027

出　　处：《光子学报》2020年第10期192-199,共8页Acta Photonica Sinica

基　　金：国家重点研究发展计划(No.2017YFC0601602);中央高校科研业务费(No.2020FZA3005)。

摘　　要：研究了射频场的频率和不同的原子相干态对瞬态效应的影响.发现,即使共振射频场突然失谐,极化态上的原子仍然会经历较强的瞬态效应,且瞬态效应的振荡频率为Ω=√Ω0^2=0+δ^2.此外,发现瞬态效应的幅度还取决于相干原子的布居,相干原子数越多,瞬态效应也就越强.最后,基于刘维尔方程计算了射频瞬态作用下原子对光强的吸收,发现实验数据与理论结果吻合良好.本文研究结果能进一步加深理解原子相干性与瞬态效应之间的关系.This paper mainly focuses on exploring the influence of the radio frequency field's frequency and the different atomic coherent situation on the transient effect.It is found that the polarized coherent atoms can still experience a strong transient effect whether the radio frequency filed is resonant or detuned with the Larmor precession frequency,and the transient oscillation frequency depends on the power and frequency of radio frequency field in terms of Ω=√Ω0^2=0+δ^2.Furthermore,the amplitude of transient effect depends on the population of the coherent atoms is explored.The more polarized coherent atoms,the stronger the transient effect presents.At last,we analyze these phenomena by calculating the absorption of beam based on the Liouville equation.There is a good agreement between the experiment data and the theoretical results.These results can provide further insight into the relationship between the coherence of atoms and the transient effect.

关 键 词：光磁共振 原子相干性 瞬态效应 拉比振荡 刘维尔方程 

分 类 号：O433.1[机械工程—光学工程] O562.3[理学—光学]