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Cold Atom Trapping with Laguerre Gauss Optical Beams

用拉盖尔高斯光束进行冷原子捕获

基本信息

批准号：
10640389
负责人：
SASADA Hiroyuki
金额：
$ 1.79万
依托单位：
Keio University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In 1998, we have constructed E experimental setup for laser cooling, and succeeded to confine ィイD185ィエD1Rb and ィイD187ィエD1Rb atoms in a magneto-optical trap. We have used an external cavity diode laser as a light source, and the laser frequency is servo locked to the saturated absorption spectral line of Rb. The laser light stopped a slow part of atoms moving in a thermal velocity in a glass cell. The attained temperature was about 100 mK, and the number of the trapped atoms was 1.2 x 10ィイD17ィエD1 corresponding to the number density of 8 x 10ィイD110ィエD1 particle/cmィイD13ィエD1.In 1999, we have improved the apparatus Ed experimental environment. To measure the temperature and density of the trapped atoms precisely, we have made an imaging system controlled by a personal computer. An air conditioner was installed in our laboratory, thus we can operate the external cavity diode laser in any season. We also add some vacuum valves between pumps and main chamber in order to prevent the Rb atoms from attacking the pump surface. We have not trapped the atoms in a Laguerre Gauss beam yet, but are very close to it.

1998年，我们建立了激光冷却的E实验装置，并成功地将氘代D185氘代D1 Rb和氘代D187氘代D1 Rb原子限制在磁光阱中。我们采用外腔半导体激光器作为光源，激光频率伺服锁定在铷原子的饱和吸收谱线上。激光阻止了玻璃池中以热速度运动的原子的缓慢部分。获得的温度约为100 mK，俘获原子数为1.2 × 10 ~（-1）D_（17）D_（17）D_（11），对应的粒子数密度为8 × 10 ~（-1）D_（110）D_（11）D_（13）D_（13）D_（11）。为了精确测量被囚禁原子的温度和密度，我们制作了一个由个人计算机控制的成像系统。我们的实验室安装了空调，因此我们可以在任何季节运行外腔半导体激光器。为了防止Rb原子对泵表面的攻击，在泵和主腔之间增加了真空阀。我们还没有将原子捕获在拉盖尔高斯光束中，但已经非常接近了。