U.S.-Korea Cooperative Research: Studies of Trapping and Cooling in a Far Off Resonance Optical Trap Using Circularly Polarized Light

9816280维曼该奖项提供资金，允许科罗拉多大学物理系和JILA(联合实验室天体物理研究所)的卡尔·E·维曼博士与韩国大学物理系赵东贤博士进行为期24个月的合作研究计划，该计划涉及建造和使用基于类比塞曼效应理论的光学陷阱。根据该理论，当激光被圆偏振并适当失谐时，它可以诱导出纯粹的塞曼位移形式的交流斯塔克位移。以这种方式构建的光陷阱除了没有麻烦的磁场梯度外，其行为将类似于磁陷阱。它将保存一个自旋极化的原子样本，这将在许多物理领域有用。合作者将开发有效地将原子从磁光陷阱加载到这样的光陷阱的方法，并计划研究被捕获原子的光谱和热力学性质。他们还将研究通常由圆偏振光构成的光学陷阱的性质，以找到在这种陷阱中的新冷却方案。具体地说，他们计划利用原子的张量极化率来开发西西弗斯冷却机制。这将对在光学陷阱中实现玻色-爱因斯坦凝聚产生影响。这个项目将得到加强。这是备受尊敬的美国和韩国研究团队之间的合作，将为美国研究生提供国际研究经验。该项目与美韩合作科学计划的目标相关，该计划旨在通过交流科学信息、想法、技能和技术以及通过在互利问题上的合作来提高美国和韩国科学家和工程师之间的合作水平。韩国的参与得到了韩国科学与工程基金会(KOSEF)的支持。

9816280WiemanThis award provides funds to permit Dr. Carl E. Wieman, Department of Physics and JILA (Joint Institute for Laboratory Astrophysics), University of Colorado, to pursue with Dr. Donghyun Cho, Department of Physics, Korea University, for 24 months, a program of cooperative research involving construction and use of an optical trap based on the theory of the analogous Zeeman effect. According to the theory, when the laser light is circularly polarized and properly detuned, it can induce an AC Stark shift that is in the form of a pure Zeeman shift. An optical trap built in this way will behave like a magnetic trap except without the troublesome magnetic field gradient. It will hold a spin-polarized sample of atoms that will be useful in many areas of physics. The collaborators will develop ways to load atoms from a magneto optical trap to such an optical trap efficiently, and also plan to study spectroscopic and thermodynamic properties of trapped atoms. They also will study properties of an optical trap built with circularly polarized light in general to find a new cooling scheme in such a trap. Specifically, they plan to use the tensor polarizability of an atom to develop a Sisyphus cooling mechanism. This will have implications in achieving Bose-Einstein condensation in an optical trap.This project will strengthen. collaboration between highly respected U.S. and Korean research teams and will provide an international research experience for a U.S. graduate student. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. Korean participation is supported by the Korea Science and Engineering Foundation (KOSEF).***