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

Pair Production of Two-Higgs-Doublet_Model Light Higgs Bosons in $\gamma \gamma$ Collisions