平行线偏光激发CPT共振方案实验研究

目前的相干布居囚禁(CPT)原子钟和CPT磁场计中普遍采用圆偏振光方案 (σ⁺-σ⁺)实现CPT共振, 该方案对原子的利用率较低. 为了提高原子的利用率, 本文实验研究了通过平行线偏振相干双色光与⁸⁷Rb原子作用实现CPT共振的方案(lin//lin). 与σ⁺-σ⁺方案相比较, lin//lin方案消除了极化暗态, 获得更多工作原子. 在相同的实验条件下, 开展对比实验研究获得了信噪比为σ⁺-σ⁺方案2倍, 微分线型信号的中心斜率为σ⁺-σ⁺方案1.65倍的CPT共振信号. 研究结果表明该方案是实现低功耗原子钟、磁场计等设备的理想候选.

Experimentally studying the scheme on exciting coherent population trapping resonances with lin//lin configuration

Coherent population trapping(CPT) atomic clocks are prevailingly realized by exciting CPT resonance with circularly polarized bichromatic coherent light(σ~+-σ~+ scheme),while atom utilization efficiency is relatively low in the scheme.For improving efficiency, we experimentally study the scheme of realizing CPT resonance through the interaction between atoms and parallel linearly polarized bichromatic coherent light field(lin//lin scheme).In the same experimental conditions the experimental results show that the signalnoise ratio of the CPT resonance signal is twice,and the differential slope is 1.65 time higher than those ofσ~+-σ~+ scheme.The experimental results reveal that the scheme is an ideal candidate for low power consuming atomic clock and magnetometer.