可控光学晶格中的冷原子和玻色—#29233;因斯坦凝聚体的研究

项目名称： 可控光学晶格中的冷原子和玻色—#29233;因斯坦凝聚体的研究

项目编号： No.10804115

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 周蜀渝

作者单位： 中国科学院上海光学精密机械研究所

项目金额： 22万元

中文摘要： 在本项目开展期间，我们获得的主要结果如下：1）采用自制的腔内电光调谐半导体激光器，实现了一维移动光学晶格，并观测了玻色—#29233;因斯坦凝聚体（BEC）在移动光学晶格中的演化。数值模拟了BEC在一维无序光学晶格中的动力学行为。设计了一种双路可控的一维光学晶格装置。2）研究了冷原子云和BEC穿越红失谐高斯光束的行为，观察到原子云的聚焦，准直和超前等有趣现象，与数值模拟吻合。我们将光学势场描述为等效折射率，采用傅里叶光学方法获得了原子透镜焦距。我们实验观察到并通过数值模拟证实了一种类似于菲涅尔双棱镜的效应。3）我们在大磁场梯度的磁光阱里实现了单原子俘获。用二元光学元件和光偶极势阱实现了原子阵列。4）建立了一套量子光源装置，获得了具有非经典关联的光子对。 已获得的研究成果为进一步开展基于光学晶格和光偶极势的量子模拟和原子光学研究打下坚固的基础。

中文关键词： 光学晶格；傅里叶光学；原子阵列；光子对

英文摘要： During the project implementing,the main results we obtained are as following: 1）We acheived an one-dimemsional moving optical lattice with a home-made intra-cavity EO crystal tuned ECDL and observed the evolution of BECs in moving optical lattices. We numerically simulated dynamical behavior of BEC in an one-dimensional disorder optical lattice. A setup of a two-channel controllable one-dimensional optical lattice was designed. 2) We studied the behavior of cold atomic clouds and Bose-Einstein condensates passing through a far red-detuned Gaussian beam.Several exotic phenomena had been produced and found, such as, the focusing and the advancement of atomic clouds. We described an optical potential with an effective refractive index and adopted Fourier optics method to derive the focal length of the atomic lens. An effect, which is analogue with Fresnel's double prism, was observed experimentally and proved by numerical simulations.3）We realized a single atom capture in a steep magnetic-optical trap. Atom arrays had been obtained based on binary optics elements and optical dipole traps. 4) We had built a quantum light source setup and generated paired photons with noclassical correlation. These results laid a solid foundation for further research about the quantum simulation and atom optics based on optical lattices and optical dipole potentials.

英文关键词： optical lattice；Fourier optics；atom array；paired photons