本文针对全球定位系统(GPS,Global Position System)接收机输出秒脉冲(1PPS,1 Pulse Per Second)信号的特点,以及相干布居囚禁(CPT,Coherent Population Trapping)原子钟输出频率信号的特性,设计并实现了GPS驯服CPT原子钟方案.我们建立...本文针对全球定位系统(GPS,Global Position System)接收机输出秒脉冲(1PPS,1 Pulse Per Second)信号的特点,以及相干布居囚禁(CPT,Coherent Population Trapping)原子钟输出频率信号的特性,设计并实现了GPS驯服CPT原子钟方案.我们建立了适合抑制1PPS信号抖动的卡尔曼滤波模型,通过理论推导和计算获得了相应噪声参数,并采用卡尔曼滤波器与平均滤波器相结合,对CPT原子钟输出频率实施滤波处理,并用GPS接收机输出的1PPS信号实施频率校准,所实现GPS驯服的CPT原子钟输出频率的中短期频率误差降低半个量级,天频率稳定度提高一个量级.展开更多
相干布局囚禁(Coherent Population Trapping,CPT)原子频标是一种功耗低、体积小、启动快的新型原子频标,温控系统是影响CPT原子频标稳定度指标的重要环节.本文介绍了通过优化设计实现CPT原子频标的高性能温控系统的方案.通过仪表放大...相干布局囚禁(Coherent Population Trapping,CPT)原子频标是一种功耗低、体积小、启动快的新型原子频标,温控系统是影响CPT原子频标稳定度指标的重要环节.本文介绍了通过优化设计实现CPT原子频标的高性能温控系统的方案.通过仪表放大器的应用提高了前端温度采集电路的温度分辨能力;通过小波分析算法对温度信号进行降噪处理;通过Δ-Σ算法实现脉冲宽度调制(Pulse Width Modulation,PWM),提高温控输出调节精度并减小谐波干扰.基于该方案实现了体积小、功耗低的温控电路,获得了较好的控温效果,改善了CPT原子频标频率稳定度指标.展开更多
为满足小型、低功耗被动型相干布居囚禁(coherent population trapping,CPT)原子频标的需要,利用开关电源芯片设计并研制了一种基于电源芯片的温控电路。实验结果表明:与常用温控电路相比,该电路控温能力与其相当,功耗降低25%,体积减少...为满足小型、低功耗被动型相干布居囚禁(coherent population trapping,CPT)原子频标的需要,利用开关电源芯片设计并研制了一种基于电源芯片的温控电路。实验结果表明:与常用温控电路相比,该电路控温能力与其相当,功耗降低25%,体积减少一半。因此,该电路特别适合小型、低功耗CPT原子频标的需要,也为其他需要小型、低功耗温控电路的应用提供了一种可选方案。展开更多
In order to exploit its potential applications, we experimentally study the dependence of ^85 Rb-based coherent population trapping (CPTi resonance on N2 buffer gas with 6 vapor cells filled with natural rubidium and...In order to exploit its potential applications, we experimentally study the dependence of ^85 Rb-based coherent population trapping (CPTi resonance on N2 buffer gas with 6 vapor cells filled with natural rubidium and N2. The experiments are carried out at different pressures and temperatures, and the results reveal that higher cell temperature makes the resonance more sensitive to N2 pressure. Thus, it is importmlt to choose a proper buffer gas pressure at a given cell temperature. This work provides valuable data for the application of 85Rb CPT resonance with a buffer gas of N2.展开更多
This paper studies a miniature low power consumption laser-pumped atom vapour cell clock scheme. Pumping ^87Rb with a vertical cavity surface emitting laser diode pump and locking the laser frequency on a Doppler-broa...This paper studies a miniature low power consumption laser-pumped atom vapour cell clock scheme. Pumping ^87Rb with a vertical cavity surface emitting laser diode pump and locking the laser frequency on a Doppler-broadened spectral line, it records a 5 × 10^-11τ-1/2 (τ〈500 s) frequency stability with a table-top system in a primary experiment. The study reveals that the evaluated scheme is at the level of 2.7 watts power consumption, 90 cm^3 volume and 10^-12τ-1/2 short-term frequency stability.展开更多
文摘报道了自行研制的894 nm高温垂直腔面发射激光器(VCSEL)以及基于此类器件的芯片级铯原子钟系统的应用实验结果.根据芯片级铯原子钟对VCSEL在特定高温环境下产生894.6 nm线偏振激光的要求,对器件的量子阱增益及腔模位置等材料结构参数进行了优化,确定增益-腔模失谐量为-15 nm,使器件的基本性能在高温环境下保持稳定.研制的VCSEL器件指标为:20—90?C温度范围内阈值电流保持在0.20—0.23 m A,0.5 m A工作电流下输出功率>0.1 mW;85.6?C温度环境下激光波长894.6 nm,偏振选择比59.8:1;采用所研制的VCSEL与铯原子作用,获得了芯片级铯原子钟实施激光频率稳频的吸收谱线和实施微波频率稳频的相干布居囚禁谱线.
文摘本文针对全球定位系统(GPS,Global Position System)接收机输出秒脉冲(1PPS,1 Pulse Per Second)信号的特点,以及相干布居囚禁(CPT,Coherent Population Trapping)原子钟输出频率信号的特性,设计并实现了GPS驯服CPT原子钟方案.我们建立了适合抑制1PPS信号抖动的卡尔曼滤波模型,通过理论推导和计算获得了相应噪声参数,并采用卡尔曼滤波器与平均滤波器相结合,对CPT原子钟输出频率实施滤波处理,并用GPS接收机输出的1PPS信号实施频率校准,所实现GPS驯服的CPT原子钟输出频率的中短期频率误差降低半个量级,天频率稳定度提高一个量级.
文摘相干布局囚禁(Coherent Population Trapping,CPT)原子频标是一种功耗低、体积小、启动快的新型原子频标,温控系统是影响CPT原子频标稳定度指标的重要环节.本文介绍了通过优化设计实现CPT原子频标的高性能温控系统的方案.通过仪表放大器的应用提高了前端温度采集电路的温度分辨能力;通过小波分析算法对温度信号进行降噪处理;通过Δ-Σ算法实现脉冲宽度调制(Pulse Width Modulation,PWM),提高温控输出调节精度并减小谐波干扰.基于该方案实现了体积小、功耗低的温控电路,获得了较好的控温效果,改善了CPT原子频标频率稳定度指标.
文摘为满足小型、低功耗被动型相干布居囚禁(coherent population trapping,CPT)原子频标的需要,利用开关电源芯片设计并研制了一种基于电源芯片的温控电路。实验结果表明:与常用温控电路相比,该电路控温能力与其相当,功耗降低25%,体积减少一半。因此,该电路特别适合小型、低功耗CPT原子频标的需要,也为其他需要小型、低功耗温控电路的应用提供了一种可选方案。
基金supported by the National Natural Science Foundation of China (Grant No. 10927403)
文摘In order to exploit its potential applications, we experimentally study the dependence of ^85 Rb-based coherent population trapping (CPTi resonance on N2 buffer gas with 6 vapor cells filled with natural rubidium and N2. The experiments are carried out at different pressures and temperatures, and the results reveal that higher cell temperature makes the resonance more sensitive to N2 pressure. Thus, it is importmlt to choose a proper buffer gas pressure at a given cell temperature. This work provides valuable data for the application of 85Rb CPT resonance with a buffer gas of N2.
基金supported by National Natural Science Foundation of China (Grant Nos 10574141 and 10675162)
文摘This paper studies a miniature low power consumption laser-pumped atom vapour cell clock scheme. Pumping ^87Rb with a vertical cavity surface emitting laser diode pump and locking the laser frequency on a Doppler-broadened spectral line, it records a 5 × 10^-11τ-1/2 (τ〈500 s) frequency stability with a table-top system in a primary experiment. The study reveals that the evaluated scheme is at the level of 2.7 watts power consumption, 90 cm^3 volume and 10^-12τ-1/2 short-term frequency stability.