  We probe the top-quark electric dipole moment (EDM) in top-quark pair
production via photon-photon fusion at a photon linear collider. We show how
linearly-polarized photon beams can be used to extract information on the
top-quark EDM without the use of complicated angular correlations of top-quark
decay products. If the luminosity of the laser back-scattered photon-photon
collisions is comparable to that of the $e^+e^-$ collisions, then the
measurement of the top-quark EDM obtained by counting top-quark-production
events in photon fusion can be as accurate as the measurement obtained by
studying the $t\bar{t}$ decay correlations in $e^+e^-$ collisions using a
perfect detector.
