  We study the production of a pair of light, neutral, CP-even Higgs bosons in
photon--photon collisions within the general Two Higgs Doublet Model (THDM).
This is a process for which the lowest order contribution in both, the Standard
Model and the THDM, appears at one loop. We find that the cross section for
this process can be much larger in the THDM than in the Standard Model and the
number of events expected at the Photon Collider will allow a determination of
some of the parameters in the scalar potential.
