Cold Atom Trapping with Laguerre Gauss Optical Beams

In 1998，我们已经建立了实验设置为laser cooling，and succeeded to confine D185 D1Rb and D187 D1Rb atoms in a magneto-optical trap. We have usedan external cavity diode laser as a light sourceand the laser frequency is servo locked to the saturated absorption spectral line of Rb. the laserlight stopped a slow part of原子活动in a thermal velocity in a glass cell. The attainedtemperature was about 100mk，and the number of the trapped atoms was 1.2 x 10 D17 d corresponding to the number density of 8xD110 D1 particle/cm D13 D1. in 1999，我们improved the apparatus Ed experimental environment. To measure the temperature and densitythe trapped atoms precisely，我们made an imaging system controlled by a personal computer. an air conditioner was安装ledin our laboratory那么我们可以操作在任何季节的任何额外的cavity diode laser .我们也可以添加一些vacuum valvesbetween pumps and main chamber in order to prevent the Rb atoms from attacking the pump surface. Wehave not trapped the atoms in a Laguerre Gauss beam yet，但非常接近。

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.