  Direct production of electron--positron pairs in two photon collisions, the
Breit--Wheeler process, is one of the basic processes in the Universe. However,
it has never been observed in laboratory because of absence of the intense
gamma-ray sources. Laser induced synchrotron sources emission may open for the
first time a way to observe this process. A feasibility of an experimental
set--up using a MeV photon source is studied in this paper. We compare several
$\gamma$--ray sources, estimate the expected number of electron--positron pairs
and competing processes by using numerical simulations including quantum
electrodynamic effects.
