  We study the possibilities to detect Majorana neutrinos in
  $\gamma \gamma$ colliders for different center of mass energies.
  We study the $W^\pm W^\pm l_j^{\mp} l_k^{\mp}$ ($l_j\equiv e ,\mu ,\tau$)
final states which are, due to leptonic number violation, a clear signature for
intermediate Majorana neutrino contribution. Such a signal (final dileptons of
the same sign) is not possible if the heavy neutrinos are Dirac particles. We
present our results for the total cross-section as a function of the neutrino
mass and the center of mass energies.
