Matter-wave interference in an axial triple-well optical dipole trap  

作　　者：周琦 陆俊发 印建平 

机构地区：[1]State Key Laboratory of Precision Spectroscopy,Department of Physics,East China Normal University [2]Department of Physics, East China Institute of Technology

出　　处：《Chinese Physics B》2010年第9期323-330,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10434060,10674047 and 10804031);the National Key Basic Research and Development Program of China (Grant No.2006CB921604);the Program for Changjiang Scholarand Innovative Research Team and Shanghai Leading Academic Discipline Project (Grant No.B408);the Youth Foundation of Jiangxi Educational Committee (Grant No.GJJ09530);the Scientific Research Foundation of ECIT (Grant No.DSH0417)

摘　　要：This paper proposes a scheme of axial triple-well optical dipole trap by employing a simple optical system composed of a circular cosine grating and a lens. Three optical wells separated averagely by -37 μm were created when illuminating by a YAG laser with power 1 mW. These wells with average trapping depth -0.5 μK and volume -74 μm^3 are suitable to trap and manipulate an atomic Bose-Einstein condensation （BEC）. Due to a controllable grating implemented by a spatial light modulator, an evolution between a triple-well trap and a single-well one is achievable by adjusting the height of potential barrier between adjacent wells. Based on this novel triple-well potentials, the loading and splitting of BEC, as well as the interference between three freely expanding BECs, are also numerically stimulated within the framework of mean-field treatment. By fitting three cosine functions with three Gaussian envelopes to interference fringe, the information of relative phases among three condensates is extracted.This paper proposes a scheme of axial triple-well optical dipole trap by employing a simple optical system composed of a circular cosine grating and a lens. Three optical wells separated averagely by -37 μm were created when illuminating by a YAG laser with power 1 mW. These wells with average trapping depth -0.5 μK and volume -74 μm^3 are suitable to trap and manipulate an atomic Bose-Einstein condensation （BEC）. Due to a controllable grating implemented by a spatial light modulator, an evolution between a triple-well trap and a single-well one is achievable by adjusting the height of potential barrier between adjacent wells. Based on this novel triple-well potentials, the loading and splitting of BEC, as well as the interference between three freely expanding BECs, are also numerically stimulated within the framework of mean-field treatment. By fitting three cosine functions with three Gaussian envelopes to interference fringe, the information of relative phases among three condensates is extracted.

关 键 词：triple-well optical trap matter-wave interference spatial light modulator 

分 类 号：O431.2[机械工程—光学工程] O562[理学—光学]