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Acta Optica Sinica

铯原子6S1/2-6P1／2-8S1/2阶梯型系统中的电磁感应透明信噪比的提高

刘慧丰, Minggui Wang, 杨保东 Yang Baodong, 温馨, 靳刚, 何军, Junmin Wang

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

为了获得高信噪比的电磁感应透明（EIT）谱线，对铯原子6S1/2-6P1／2-8S1/2阶梯型能级系统的EIT谱进行了研究。探测光的频率锁定于基态到中间态的超精细跃迁线上，控制光在中间态到激发态超精细跃迁线之间扫描，得到的EIT谱具有平坦的背景，提高了光谱的信噪比。阶梯型能级系统中光谱信号强度不仅与控制光束和探测光束的传播方向有关，而且与控制光功率有关。最终，获得了高信噪比的EIT谱线。

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•May 6, 2013•3 citations
为了获得高信噪比的电磁感应透明（EIT）谱线，对铯原子6S1/2-6P1／2-8S1/2阶梯型能级系统的EIT谱进行了研究。探测光的频率锁定于基态到中间态的超精细跃迁线上，控制光在中间态到激发态超精细跃迁线之间扫描，得到的EIT谱具有平坦的背景，提高了光谱的信噪比。阶梯型能级系统中光谱信号强度不仅与控制光束和探测光束的传播方向有关，而且与控制光功率有关。最终，获得了高信噪比的EIT谱线。
目的研究Cs（6P3，2）＋Cs（6P3/2）→Cs（nLJ=8S1／2，4F5／2，4F7／2）＋Cs（6S1／2）碰撞能量合并过程。方法利用一台单模半导体激光器共振激发6P3／2态，利用另一与泵浦激光束反向平行的单模激光束作为吸收线探测激发态原子密度及其空间分布，吸收线调至6P3／2—8S1／2跃迁，并可平行于泵浦激光束移动。由激发态原子密度和谱线的荧光强度比得到碰撞能量合并的截面。结果碰撞转移到8S1/2，4F5/2和4F7/2的截面分别是（5．43±1．56）×10^-16cm2，（4．89±1．16）×10^-16cm2和（6．17±1．60）×10^-16cm2。结论计算结果是准确的并与其它实验结果进行了比较。
The narrow electromagnetically-induced transparency (EIT) resonance peaks are observed with two low-power counter-propagating diode lasers in cesium (Cs) 6S1/2 - 6P1/2 - 8S1/2 ladder-type atomic system. To precisely determine the centers of resonance peaks, multiple background-free EIT signals are achieved using a novel scanning scheme in which the coupling laser driving Cs 6P1/2 - 8S1/2 transition is scanned and the probe laser driving Cs 6S1/2 – 6P1/2 is frequency locked. A temperature-stabilized fiber-pigtailed waveguide-type phase electro-optical modulator (EOM) and a stable confocal Fabry-Perot cavity are used as a precise frequency marker to measure the hyperfine splitting of Cs 8S1/2 state. The impact of the external magnetic field on the measurement is also investigated. Furthermore, the hyperfine structure constant (here it is the hyperfine magnetic dipole constant, A) of Cs 8S1/2 state is determined to be A = 219.06 MHz ± 0.12 MHz based on the measured hyperfine splitting (Δhfs = 876.24 MHz ± 0.50 MHz).