Attosecond control of electronic motion using light wave synthesis

We demonstrate that the motion and recollision of an electron after tunnelling in the field of the laser can be fully determined by phase-locked, orthogonal two-colour laser fields. Design rules for the field to arbitrarily define the instants of ionization and return, the angle between ejection and recollision and the return energy are given and applications of this technique to attosecond physics are discussed.