Abstract
To realize Bose-Einstein condensation (BEC),we decide to build up a new system called “ Double Magneto-Optical Trap”(DMOT)in our lab. This is different from the old system (single Magneto-Optical Trap). In DMOT system, we use a chamber as the first MOT, and second MOT is a cell made with Pyrex .We trap the atoms in the first MOT，the number of atoms is 1.3 x109.After trapping the atoms, a laser beam named ”Push beam” pushes atoms from first MOT to second MOT. The frequency of the push beam is on resonance(|5S1/2,F=2>□|5P3/2,F’=3>).The second MOT is collecting the atoms from first MOT. We trap 5.77 x10^7 atoms in second MOT per push time. The efficiency is 4.4 %.We need enough atoms in evaporative cooling which is an important step before the birth of BEC. In my thesis, we have succeeded in building the DMOT system,and also transported the atoms from first MOT to second MOT .To realize BEC, we still have some works to do in the future. This is the beginning,I believe we can see the beautiful phenomenon of BEC in this new system .