  We propose methods to generate and manipulate vortex dipoles in a
Bose-Einstein condensate using Gaussian beams of red or blue-detuned laser.
Velocity-controlled vortex dipoles are shown to be created and launched by a
red-detuned beam and by two blue-detuned beams. Critical velocities for the
vortex nucleation are investigated. The launched vortex dipoles can be trapped,
curved, accelerated, and decelerated using Gaussian beams. Collisions between
vortex dipoles are demonstrated.
