Cold Atom Trapping with Laguerre Gauss Optical Beams

In1998，we have constructed E experimental setup for laser cooling，and succeeded to confine I D185个D 1 Rb and I D 187个D 1 Rb 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 about100mK，and the number of the trapped atoms was1.2x10 I D17文件D1 corresponding to the number density of 8x10 I D110文件D1 particle/cm文件D13文件D1.In1999，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。

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.