Physics of Laser Cooling and Atomic Gas BEC

激光冷却和原子气体 BEC 物理

• 批准号: 11216201
• 负责人: KUGA Takahiro
• 金额: $ 89.79万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11216201/
• 关键词: LASER COOLING; BEC; DIFFRACTION OF ATOMS; ATOM INTERFEROMETER; ATOMIC WAVE AMPLIFICATION; RUBIDIUM; MICRO-CAVITY; LAGUERRE-GAUSS; ボーズアインシュタイン凝縮; 光群速度遅延・先駆; 共振器量子電気力学; 高輝度極低温原子線; 光トラップ; rf放電; 液体ヘリウム; 原子波干渉計; コヒーレント原子波光学; 分散イメージング; 非破壊測定 /; LASER COOLING; BEC; DIFFRACTION OF ATOMS; ATOM INTERFEROMETER; ATOMIC WAVE AMPLIFICATION; RUBIDIUM; MICRO-CAVITY; LAGUERRE-GAUSS; ボーズアインシュタイン凝縮; 光群速度遅延・先駆; 共振器量子電気力学; 高輝度極低温原子線; 光トラップ; rf放電; 液体ヘリウム; 原子波干渉計; コヒーレント原子波光学; 分散イメージング; 非破壊測定 /

The main achievement of the A3 project was the physics related to the rubidium atoms BEC. The A3 was operated by three groups. Kuga et al worked on (1) the first realization of BEC in Japan, (2) physics related to the BEC, (3) the development of an improved BEC apparatus, and (4) the cavity quantum electrodynamics that combines a laser cooled atom and a microcavity. (1) The BEC was achieved, first, by collecting pre-cooled Rb atoms under a high vacuum, transferring atoms into a magnetic trap, adiabatically compress the atomic cloud, and then, by evaporative cooling. (2) Three experiments were done. (I) the diffraction of BEC atoms in a standing wave of light that demonstrated Raman-Nath, Bragg, and Stern-Gerlach type diffractions. (ii) Demonstration of a Mach Zhender type atom interferometer. (iii) The amplification of a coherent atomic wave by using atom-photon four wave mixing. (3) To increase the luminosity of the BEC, they developed a Zeeman slower that can supply 10^11 atoms per seconds continuously at the speed of 20m/s. (4) Approximately 10 laser cooled Rb atoms were introduced into a micro-cavity of 70microm meter spacing. They observed both subliminal and superliminal propagations of a laser pulse through the cavity. Hirano et al worked on the physics of the Rb BEC. (1) Dynamics of BEC when an uniform off-resonant laser beam is illuminated. (2) The oscillation of BEC cloud in a single beam optical dipole trap. Sasada et al developed a new type of cold metastable He atomic beam source that was obtained through the discharge of cryogenically cooled helium gas. They worked also on the Laguerre-Gauss laser beam that is to be used for a dark optical trap and guide.

A3项目的主要成就是与Rubidium Atoms Bec相关的物理学。 A3由三个组运营。 Kuga等人致力于（1）BEC在日本的首次实现，（2）与BEC相关的物理学，（3）改进的BEC设备的发展，以及（4）结合激光冷却原子和微腔的腔量子电动力学。 （1）首先，通过在高真空下收集预冷的RB原子，将原子转移到磁陷阱中，绝热地压缩原子云，然后通过蒸发冷却来实现BEC。 （2）进行了三个实验。 （i）贝克原子在驻光线中的衍射，表现出拉曼 - 境，布拉格和斯特恩 - 格拉赫型衍射。 （ii）演示马赫ZHENDER类型原子干涉仪。 （iii）通过使用原子 - 光子四波混合的相干原子波的扩增。 （3）为了增加BEC的发光度，他们开发了一个慢慢的Zeeman，可以以20m/s的速度连续提供10^11个原子。 （4）将大约10个激光冷却的RB原子引入了70microm仪表间距的微腔。他们观察到通过腔体激光脉冲的潜意识和超限性传播。 Hirano等人从事RB BEC的物理学工作。 （1）当均匀的非谐振激光束被照亮时，BEC的动力学。 （2）单束光学偶极子陷阱中BEC云的振荡。 Sasada等人开发了一种新型的冷亚固定型原子束来源，该束是通过排放低温冷却的氦气而获得的。他们还在拉瓜仪激光束上工作，该光束将用于黑暗的光学陷阱和指南。