  Production of the Standard Model Higgs-boson at the photon collider at TESLA
is studied for the Higgs-boson masses above 170 GeV. By reconstructing WW and
ZZ final states, not only the h to gamma-gamma partial width but also the phase
of the scattering amplitude can be measured. This opens a new window onto the
precise determination of the Higgs-boson couplings.
