Collisions between two dissipative optical bullets separated in space

We present the numerical results of both head-on and non-head-on collisions between two stable dissipative optical bullets(DOBs) in a three-dimensional complex Ginzburg-Landau equation with cubic-quintic nonlinearity.The system parameters chosen are in the coexistence regions for both stationary DOBs and double bullet complexes(DBCs).By varying the initial velocities v and the impact parameters P which represent the distance between the parallel trajectories of colliding bullets,we observe three generic pro...