  A maser curvature emission mechanism in the presence of curvature drift is
used to explain the optical pulsations from anomalous X-ray pulsars. For the
source of AXP0142+61,the optical pulsation occurs at the radial distance
$R(\nu_M)\sim 4.75\times 10^9$ cm to the neutron star. The corresponding
curvature maser frequency is about $\nu_M\approx1.39\times 10^{14}$ Hz. The
result is consistent with the observation of the optical pulsations from the
anomalous X-ray pulsar 4U0142+61.
