物理学报2024，Vol.73Issue(2)：131-138,8.DOI:10.7498/aps.73.20231408
相干布居囚禁振荡与拉曼失谐的关系
Relationship between coherent population trapping oscillation and Raman detuning
摘要
Abstract
Coherent population trapping(CPT)oscillation is a transient oscillation phenomenon based on the CPT effect,which is related to the Raman detuning of the coherent bichromatic laser fields from the hyperfine ground-states of three-level Λ system.In this work,sawtooth wave is adopted to modulate the frequency of microwave signal to make Raman detuning change uniformly and stepping.Meanwhile,by building the relationship between the microwave frequency modulation rate and the change rate of Raman detuning,the effects of the change rate and mode of Raman detuning on CPT oscillation are analyzed respectively.The results reveal that when the Raman detuning changes uniformly,the CPT oscillation will occur on condition that the change rate is high enough,and the excited oscillations show non-harmonic oscillation behavior.When the Raman detuning is triggered off by step change,the excited CPT oscillation is a damping oscillation,and the oscillation frequency is equal to the frequency of Raman detuning.The modulation of Raman detuning is realized by using sawtooth wave to modulate the microwave frequency,and then the complete establishment of CPT state and the complete attenuation of CPT oscillation process are achieved.This work presents a new modulation method to realize the CPT oscillation,which shows great application potential in the field of weak magnetic measurements and atomic clocks.关键词
相干布居囚禁/瞬态振荡/拉曼失谐/阻尼振荡Key words
coherent population trapping/transient oscillation/Raman detuning/damping oscillation引用本文复制引用
韩艳晨,李昱东,李维..相干布居囚禁振荡与拉曼失谐的关系[J].物理学报,2024,73(2):131-138,8.基金项目
航空工业计量所创新基金(批准号:ZC02201580)和计量与校准技术实验室基金(批准号:JLJK2022001B003)资助的课题. Project supported by the Innovation Fund of the Changcheng Institute of Metrology&Measurement,China(Grant No.ZC02201580)and the Science and Technology on Metrology and Calibration Laboratory,China(Grant No.JLJK2022001B003). （批准号:ZC02201580）
