Cold Atom Trapping with Laguerre Gauss Optical Beams

在1998年，我们为激光冷却和成功地确定了E实验设置，使其能够在磁光学陷阱中实现D185-D1 Rb和D187-D1 Rb原子。我们使用了一个外部腔二极管激光器作为光源，并且激光频率被伺服锁定到Rb的饱和吸收光谱线。激光灯停止了原子在玻璃细胞中的一个缓慢的部分移动。温度约为100微米，被困原子的数量为1.2 x10 × D17 × D1，与8x 10 × D110粒子/厘米D13 × D1的数量相比，1999年，我们改进了装置Ed实验环境。为了精确地测量被困原子的温度和密度，我们用个人计算机制造了一个成像系统。一个空调机是在我们的实验室安装的，所以我们可以在任何季节操作外部腔二极管激光器。我们还在泵和主室之间添加一些真空阀门，以防止从泵表面攻击RB原子。我们还没有把原子困在拉奎尔·高斯光束里，但离它很近。

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.