微型CPT原子钟泵浦方法试验研究

Experimental Study on Pumping Methods of Micro CPT Atomic Clock

CPT原子钟是一种基于相干布居囚禁(CPT)原理的小型原子钟,其不含微波谐振腔的特点有利于降低物理系统的体积与功耗。为探索适用于微型CPT原子钟的泵浦方法,在物理系统体积、功耗和复杂度的限制下,选出单一圆偏振光、平行线偏振光和椭圆偏振光三种方法。基于6 mm×6 mm×6 mm的微型87Rb原子气室,搭建桌面系统测得三种方法下CPT共振信号的线宽和信噪比数据。结果表明微型CPT原子钟更适合采用椭圆偏振光方法。

The(Coherent Population Trapping)CPT atomic clock is a compact atomic frequency standard based on the principle of coherent population trapping,which does not require a microwave resonant cavity,which is beneficial for reducing the volume and power consumption of physical systems.In order to explore polarization pumping methods suitable for micro CPT atomic clocks,three pumping methods were selected,including single circularly polarized light,parallel linearly polarized light,and elliptical polarized light,under the limitations of physical system volume,power consumption,and complexity.Based on the 6mm×6mm×6mm micro 87 Rb cell,desktop systems were constructed to measure the linewidth and SNR of CPT resonance signals using three methods.The results show that micro CPT atomic clocks are more suitable for using elliptically polarized light method.