一种高信噪比铷原子频标物理系统

摘要

物理系统是铷原子频标的核心部件,通过分析物理系统原子鉴频信号信噪比对频标频率稳定度的影响机理,对物理系统内部结构进行了改进.改进后的物理系统采用了优化的开槽管微波腔,用Xe气作为起辉气体的铷光谱灯,采用分离滤光的三泡设计方案.对改进后的系统进行了初步测试,秒稳定度约为8×10(-13).此结果表明铷原子频标的稳定度可以突破1×10(-12)/τ(1/2),铷原子频标的长期稳定度还有进一步提高的潜力.%Physics package is the core of the atomic frequency standard. By analyzing the mechanism which Signal to Noise Ratio (SNR) of the atomic discrimination signal affect the frequency stability, a modified physics package was made.This physics package is designed according to the three cell scheme, in which a slotted tube microwave cavity and a rubidium spectrum lamp with Xe as the buffer gas were used. A preliminary test on the physics package was carried out, and a short term frequency stability of nearly 8 × 10-13/1s was achieved. This result shows that the frequency stability of an rubidium atomic frequency standard can be better than 1 × 10-12/√τ , and there is still space to improve long term performance of the rubidium atomic frequency standard.