Analysis of Runaway Evaporation and Bose--Einstein Condensation by Time-of-Flight Absorption Imaging
CHEN Shuai1,3, ZHOU Xiao-Ji1,2, YANG Fan1,2, XIA Lin1,2, SUN Ya-Ya1,2, WANG Yi-Qiu1,2, CHEN Xu-Zong1,2
1Key Laboratory for Quantum Information and Measurements of Ministry of Education,Peking University, Beijing 100871
2School of Electronics Engineering and Computer Science, Peking University, Beijing 100871
3Department of Physics, School of Physics, Peking University, Beijing 100871
Analysis of Runaway Evaporation and Bose--Einstein Condensation by Time-of-Flight Absorption Imaging
1Key Laboratory for Quantum Information and Measurements of Ministry of Education,Peking University, Beijing 100871
2School of Electronics Engineering and Computer Science, Peking University, Beijing 100871
3Department of Physics, School of Physics, Peking University, Beijing 100871
Abstract： The achievement of Bose--Einstein condensation (BEC) in our experiment is reported. The process of BEC formation is observed by detecting the image after free expansion, in which the effectiveness of runaway evaporative cooling is shown by measuring the optical density of the atom cloud. About 2×10587Rb atoms in the |F=2,mF=2> state are condensed into the condensate. The ratio of axial-to-radial size of the condensate released from the magnetic trap is investigated in theory and experiment.
2004, Vol. 21 
