Measurement of velocity distribution in an atomic beam by means of Doppler resonance fluorescence

Introduction Measurement of velocity distribution in atomic beams is of significance to laser spec-troscopy and atomic physics.Previously,workers used to investigate atomic velocity distribu-tion by means of mechanic separators.Recently, spectroscopic methods of measuring veloc-ity distribution are developed,which find velocity distribution from detecting atomic fluo-rescence frequency distribution or from detecting atomic deflection due to radiation force.Un-fortunately,these methods can not realize real time measurement.In this paper we propose a