脉冲光抽运铷原子钟C场电流源分析设计

Analysis and design of current source of C-field for the pulsed optically pumped rubidium clock

脉冲光抽运铷原子钟的稳定度会受到多种因素的影响,其中磁场就是重要的影响因素之一。分析了C场电流对脉冲光抽运铷原子钟稳定度的影响,利用差动放大器为核心设计研制了新型C场电流源。测试表明,电流源1 Hz和10 Hz处的噪声分别为3nA/Hz1/2和1.5nA/Hz1/2,电流相对起伏为2×10-5,温度漂移为5ppm/℃。它产生的C场对脉冲光抽运铷原子钟1s处稳定度的影响小于7×10-16,1ks处的影响小于1×10-16,10ks处的影响小于5.3×10-17。结果表明,该电流源的噪声、相对起伏和温度漂移等性能满足脉冲光抽运铷原子钟要求。

The stability of the pulsed optically pumped Rb clock is influenced by several effects,the magnetic field fluctuation is one of the most important one.In this paper,the influence of C-field on the stability of the pulsed optically pumped Rb clock was analyzed,and a new current source of C-field was designed by utilizing differential amplifier.The test results show that the noise is 3 nA/Hz1/2 and 1.5 nA/Hz1/2 at 1 Hz and 10 Hz Fourier frequencies,respectively,the relative current fluctuation is 2×10-5 and the temperature coefficient is 5 ppm/℃.The impact on stability performance of the pulsed optically pumped Rb clock is less than 7×10-16 at 1 s,1×10-16 at 1 ks,and 5.3×10-17 at 10 ks.The results show that the designed C-field current source can meet the requirements of the pulsed optically pumped Rb clock.