  We have demonstrated and modeled a simple and efficient method to transfer
atoms from a first Magneto-Optical Trap (MOT) to a second one. Two independent
setups, with cesium and rubidium atoms respectively, have shown that a high
power and slightly diverging laser beam optimizes the transfer between the two
traps when its frequency is red-detuned from the atomic transition. This
pushing laser extracts a continuous beam of slow and cold atoms out of the
first MOT and also provides a guiding to the second one through the dipolar
force. In order to optimize the transfer efficiency, the dependence of the
atomic flux on the pushing laser parameters (power, detuning, divergence and
waist) is investigated. The atomic flux is found to be proportional to the
first MOT loading rate. Experimentally, the transfer efficiency reaches 70%,
corresponding to a transfer rate up to 2.7x10^8 atoms/s with a final velocity
of 5.5 m/s. We present a simple analysis of the atomic motion inside the
pushing-guiding laser, in good agreement with the experimental data.
