The evolution of laser generated plume in ambient gates was investigated using laser beam deflection technique. A XeCl excimer laser was employed to initiate the vaporization of graphite and copper targets. The information drawn from the spatially and temporally resolved deflection signals makes us to estimate the plume drifting velocities and expansion-velocities at different sarge of evolution. Also, the deflection signals showed that drifting of the laser blow-off material developed a shock wave which moves ahead of the material wave.