Abstract
In experiment, we observe 85Rb atoms and 85Rb2 molecules collision in crossed dipole trap by using absorption image method to measurement the Rb atoms lifetime and calculate the numbers of 85Rb2 molecules in a crossed dipole trap. We use high power laser (non-single frequency Fiber laser, 1080 nm, 20W) for a laser source of crossed dipole trap. The crossed dipole trap can be seen from CCD image system, we use absorption image and fluoresce method to measure lifetime, atom number, and temperature in a crossed dipole trap. The number of atoms in crossed dipole trap is about 1.13x105 atoms, the average density is atom/cm3.The atoms in ground state F=3, the temperature is about 400 and the life time less than 100 msec. The atoms in ground state F=2, the temperature is about 44 and the lifetime is 100~200 msec. By using photoassociation method to generate 85Rb2 molecules, and load in crossed dipole trap with Rb atoms at the same time, the lifetime of atom in ground state (F=2) is 79msec.