Increasing the number of atoms that interact with microwave fields represents a promising strategy for enhancing the sensitivity of Rydberg atom-based superheterodyne receivers.Nevertheless,the practical implementatio...Increasing the number of atoms that interact with microwave fields represents a promising strategy for enhancing the sensitivity of Rydberg atom-based superheterodyne receivers.Nevertheless,the practical implementation of this approach is impeded by adverse effects such as excitation saturation of Rydberg atoms and power broadening.Here,we demonstrate enhanced microwave field measurements based on two specific velocity groups of atoms,simultaneously addressed by dual-channel probe beams in a Sagnac loop interferometer.The application of resonance detuning in two-photon excitation enables selective addressing of atoms moving along the beam direction,thereby significantly mitigating atomic transit noise.At 7.97 GHz,our method yields a 3 dB improvement in signal-to-noise ratio(SNR),achieving a sensitivity of 10.7 nV·cm^(−1)·Hz^(−1/2).This approach offers a viable pathway to further improve the sensitivity of Rydberg atom-based microwave electrometers.展开更多
长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感...长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感的实验研究,主要是通过改变基于Sagnac环级联LPFG的轴向应变,来分析透射谱中选定损耗峰的幅值的变化情况。实验结果表明,随着轴向应变的改变,损耗峰的幅值呈线性变化,单个LPFG的灵敏度为-1.284×10^(-2)dB·με^(-1),而基于Sagnac环级联LPFG的灵敏度高达-1.0118×10^(-1)d B·με^(-1),是前者的7.88倍左右,且二者都具备非常好的方向可重复性。展开更多
基金supported by the National Key R&D Program of China(Grant No.2022YFA1404003)the National Natural Science Foundation of China(Grant Nos.T2495252,12104279,and 123B2062)+2 种基金the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302100)the Fund for Shanxi“1331 Project”Key Subjects Constructionthe Bairen Project of Shanxi Province。
文摘Increasing the number of atoms that interact with microwave fields represents a promising strategy for enhancing the sensitivity of Rydberg atom-based superheterodyne receivers.Nevertheless,the practical implementation of this approach is impeded by adverse effects such as excitation saturation of Rydberg atoms and power broadening.Here,we demonstrate enhanced microwave field measurements based on two specific velocity groups of atoms,simultaneously addressed by dual-channel probe beams in a Sagnac loop interferometer.The application of resonance detuning in two-photon excitation enables selective addressing of atoms moving along the beam direction,thereby significantly mitigating atomic transit noise.At 7.97 GHz,our method yields a 3 dB improvement in signal-to-noise ratio(SNR),achieving a sensitivity of 10.7 nV·cm^(−1)·Hz^(−1/2).This approach offers a viable pathway to further improve the sensitivity of Rydberg atom-based microwave electrometers.
文摘长周期光纤光栅(Long period fiber Grating,LPFG)作为一种透射型的光纤无源器件,它的谐振波长和损耗峰幅值对外界环境的变化,尤其对于轴向应变,非常敏感。本文对单个LPFG以及将级联LPFG内嵌于萨格纳克环(Sagnac环)进行了轴向应变传感的实验研究,主要是通过改变基于Sagnac环级联LPFG的轴向应变,来分析透射谱中选定损耗峰的幅值的变化情况。实验结果表明,随着轴向应变的改变,损耗峰的幅值呈线性变化,单个LPFG的灵敏度为-1.284×10^(-2)dB·με^(-1),而基于Sagnac环级联LPFG的灵敏度高达-1.0118×10^(-1)d B·με^(-1),是前者的7.88倍左右,且二者都具备非常好的方向可重复性。
