一维光晶格势中玻色凝聚气体干涉图样演化特性研究  

Research on Property of Interference Pattern for Bose-Condensed Gas in One-Dimensional Optical Lattice

作　　者：徐志君[1] 李鹏华[1] 何芳[1] 

机构地区：[1]浙江工业大学应用物理系,浙江杭州310032

出　　处：《光学学报》2009年第2期523-528,共6页Acta Optica Sinica

基　　金：浙江省教育厅重点科研(20070296)资助项目

摘　　要：陷俘在一维光晶格势中的玻色凝聚气体,将形成许多小的子凝聚原子云。将这些子凝聚原子云视作相干的物质波波源,求出其宏观波函数,然后对物质波干涉图样的演化特性,如粒子数密度、粒子流密度、干涉峰的运动速度以及宏观波函数的相位性质等进行研究,并讨论了当相邻子凝聚原子云间存在相对相位差时,对物质波干涉图样的影响。研究表明,物质波干涉峰是一个以一定速度运动的波包,其波长由德布如意关系式确定,波包的相位特点类似于平面波。An array of condensations trapped in one-dimensional （1D） optical lattice is used as a source of coherent matter wave to investigate the coherence properties of the Bose-einstein condensates （BEC）. The macrowave function for matter wave interference is given. Based on the wave function, the distribution of particle number density, particle current density, velocity of interference peak movement and phase of the macrowave function were studied. The evolution of the interference pattern under a varible relative phase difference between successive optical lattice sites is also discussed. The research shows that the peak of interference is a wave packet with a fixed velocity, the wavelength satisfies the relation of de Broglie, and the evolution of the wave packet phase can be approximated by the classical plane wave.

关 键 词：量子光学 波函数 子凝聚原子云 干涉 

分 类 号：O431.2[机械工程—光学工程]