Comparison of two absorption imaging methods to detect cold atoms in magnetic trap  

作　　者：王妍 胡朝晖 亓鲁 

机构地区：[1]Science and Technology on Inertial Laboratory,School of Instrumentation Science and Opto-electronics Engineering,Beihang University

出　　处：《Chinese Physics B》2015年第2期146-151,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61227902 and 61121003);the National Defense Basic Scientific Research Program of China(Grant No.B2120132005)

摘　　要：Two methods of absorption imaging to detect cold atoms in a magnetic trap are implemented for a high-precision cold atom interferometer.In the first method,a probe laser which is in resonance with a cycle transition frequency is used to evaluate the quantity and distribution of the atom sample.In the second method,the probe laser is tuned to an open transition frequency,which stimulates a few and constant number of photons per atom.This method has a shorter interaction time and results in absorption images which are not affected by the magnetic field and the light field.We make a comparison of performance between these two imaging methods in the sense of parameters such as pulse duration,light intensity,and magnetic field strength.The experimental results show that the second method is more reliable when detecting the quantity and density profiles of the atoms.These results fit well to the theoretical analysis.Two methods of absorption imaging to detect cold atoms in a magnetic trap are implemented for a high-precision cold atom interferometer.In the first method,a probe laser which is in resonance with a cycle transition frequency is used to evaluate the quantity and distribution of the atom sample.In the second method,the probe laser is tuned to an open transition frequency,which stimulates a few and constant number of photons per atom.This method has a shorter interaction time and results in absorption images which are not affected by the magnetic field and the light field.We make a comparison of performance between these two imaging methods in the sense of parameters such as pulse duration,light intensity,and magnetic field strength.The experimental results show that the second method is more reliable when detecting the quantity and density profiles of the atoms.These results fit well to the theoretical analysis.

关 键 词：absorption imaging open-channel transition cold atoms magnetic trap 

分 类 号：O562[理学—原子与分子物理] TS803.4[理学—物理]