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We calculate the cross section of the lightest Higgs boson pair production atthe Photon Linear Collider in the two Higgs doublet model. We focus on thescenario in which the lightest Higgs boson has the standard model likecouplings to gauge bosons. We take into account the one-loop correction to the$hhh$ coupling as well as additional one-loop diagrams due to charged bosons tothe $\gamma\gamma \to hh$ helicity amplitudes. We discuss the impact of thesecorrections on the $hhh$ coupling measurement at the Photon Linear Collider.

Higgs boson pair production at the Photon Linear Collider in the two Higgs doublet model