冷原子束在线检测系统

An Online Detection System for Atomic Beam

应用荧光法和飞行时间(TOF)法实现了冷原子束纵向速度谱、通量及原子能态分布的在线检测。设计用于荧光收集的光学系统和机械结构,实现了焦距可微调的即插即用式荧光检测装置,实现了冷原子束检测系统的集成性和检测结果的高信噪比(SNR)。利用LabView软件实现对光电倍增管(PMT)、飞行时间法检测时序及检测激光的扫频范围等的控制,可在线得到原子束性能参数,并对数据进行平滑处理。检测结果表明,检测系统检测信号的信噪比为57:1(在20ms内)。

An online detection system is developed for measuring the longitudinal velocity spectrum, flux and populations in specific states of an atomic beam, through the fluorescence and the time of flight （TOF） method. A fluorescence collection optical system with a plug and play and focal length adjustable mechanical structure is designed to improve the system integration and the signal to noise ratio （SNR）. The system is used to measure and analyze on- line performance of an atomic beam, with a program based on LabView for the control of the photomultiplier tubes （PMT）, the timing of TOF, the sweep range of the probe laser, and smoothing the results. The experimental results show that the SNR up to 57： 1 （in 20 ms） can be obtained in this system.