【摘要】 6S1/2→6P3/2→49D5/2基于铯里德伯原子的电磁诱导透明效应,当光与原子能级频率共振时,色散将剧烈变化,吸收减弱.此时光脉冲在原子介质中传播时,将会出现减速.在铯原子阶梯型三能级系统中,观察到由色散曲线陡峭变化导致的探测光脉冲减速现象,并系统研究了耦合光强度和原子气室温度对光脉冲减慢的影响.实验结果表明,耦合光越弱,延迟时间越长;原子气室温度越高,减速效应越明显,与理论计算相符.实验结果为之后进行的通过光脉冲减速效应测量微波电场提供了实验基础.更多还原

【Abstract】 Based on the Electromagnetically-Induced-Transparency(EIT) effect of cesium Rydberg atoms, the dispersion of the probe light will experience a drastically change while the absorption is diminished, as the frequency of it is resonated with that of the corresponding atomic transition. In this case, as the light pulse propagates in the atomic medium, the group velocity of the pulse will be slowed. In the cesium atoms 3-ladderlevel system( 6 S1/2→ 6 P3/2→ 49 D5/2),the frequency of the probe light is locked at the resonance transition of6 S1/2→ 6 P3/2, while the transmission signal of 852 nm probe light is measured by scanning the coupling light frequency near the transition of 6 P3/2→ 49 D5/2, We observed the EIT phenomenon and explored the relationship between the power of coupling laser and linewidth of the EIT signal. The experimental results show that the linewidth of the EIT signal is proportional to the power of the coupling laser. Then under the twophoton resonance condition, the deceleration of the probe light pulse caused by the steep change of the dispersion curve is observed. We also systematically investigate the influences of coupling optical power and temperature of vapor cell on the slowing down of light pulse. The experimental results show that the weaker the coupled light was, the longer the delay time; and the higher the temperature of the atomic gas chamber was,the more obvious the deceleration effect would be observed, those of which are consistent with the theoretical calculations. The investigation of the deceleration of optical pulses based on the Rydberg ElectromagneticallyInduced-Transparency is important for understanding the coherence mechanism of 3-ladder-level system and some potential applications, such as in Rydberg-atom-based electric field metrology. This research provides a new tool for the measurement of pulsed microwave electric field through the optical pulse deceleration effect.更多还原