脉冲微波式氢原子钟初步结果

通过向原子钟微波腔内导入相干的脉冲微波信号,同时设置适当的脉冲信号参数,可以激发原子共振跃迁的Ramsey条纹,利用其中心条纹作为钟跃迁可以极大地压缩原子钟的谱线宽度,有望提高原子钟的电性能指标.该项技术已经在pop铷钟上得到应用,成功压缩了铷原子的共振谱线线宽.中国科学院上海天文台在被动型氢原子钟物理系统的基础上,开展了氢原子微波脉冲激励技术的研究,设计了微波脉冲扫频电路,目前已经初步观测到氢原子的Ramsey条纹,从而证明了该项技术用于氢原子钟的可行性.计划优化系统和微波信号参数,从而进一步压缩原子线宽.同时设计完善的伺服电路,实现原子钟的环路锁定,形成脉冲微波式氢原子钟,并测试和优化了整机性能指标.

Preliminary result of pulsed microwave hydrogen maser

Adequate coherent pulsed microwave input into microwave cavity of atomic clock can induce Ramsey fringes of the atomic transition.By which the line width of atomic clock can be greatly reduced and the performance might be improved.This method has been applied in the POP rubidium clock.Shanghai Astronomical Observatory,Chinese Academy of Sciences has studied the application of this method in passive hydrogen maser.The electrical circuit for the pulsed microwave frequency sweeping has been designed,and the Ramsey fringes of hydrogen atom have been observed,which means that this method for passive hydrogen maser is feasible.We plan to optimize the parameter of the system and microwave pulse to further reduce the line width.And the designed full-scale servo circuit realizes the pulsed microwave hydrogen maser.Finally the system performance will be measured and optimized.