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Cross section for pion pair production by photon-photon collisions are estimated near the threshold using a relativitic quark clustering model.A realistic qq wave function of the pion was determined by fitting the pion charge form factor up to q^2 = 4 ~ 6 GeV^2/c^2, the weak decay constant and the pion charge radius.The composite structure of the pion provides a simple explanation for the energy dependence and magnitudes of pi^+pi^- and pi^0 pi^0 pair productions

Relativistic Quark Clustering in the gamma gamma -> pi^+ pi^- and pi^0 pi^0 reactions