基于原子拉比共振的原子气室弛豫率测量

Atomic Vapor Cell’s Relaxation Rate Measurement Based on Atomic Rabi Resonance

原子气室是量子精密测量仪器中的核心部件,原子弛豫率是原子气室的重要参数之一。针对原子弛豫率的测量,通过Comsol Multiphysics软件设计了一个微波腔,并模拟了原子气室内的微波传播过程,验证了微波腔设计的合理性。并搭建了一套测量原子气室弛豫率的系统,用快速傅里叶变换分析仪(FFT)测得了拉比共振的线型。通过处理实验数据,得到了原子气室弛豫率,比理论计算原子弛豫率更加方便准确。

The atomic vapor cell is a core component in quantum precision measurement instruments,and the atomic relaxation rate is one of the important parameters of the cell.For the measurement of atomic relaxation rate,a microwave cavity was designed by Comsol Multiphysics software,and the microwave propagation process in the atomic gas chamber was simulated,which verified the rationality of the microwave cavity design.A system for measuring the relaxation rate of the atomic vapor cell was built,and the line shape of the Rabi resonance was measured with a fast Fourier transform analyzer(FFT).The cell relaxation rate was obtained by processing the experimental data,and this method is more convenient and accurate than the theoretical calculation of atomic relaxation rates and does not require excessive experimental conditions.