  By employing the time-dependent Lanczos method, the nonequilibrium process of
the half-filled one-dimensional extended Hubbard model under the irradiation of
a transient laser pulse is investigated. We show that in the spin-density-wave
(SDW) phase, the antiferromagnetic spin correlations are impaired by the
photoinduced charge carriers. Near the phase boundary between the SDW and
charge-density-wave (CDW) phases, a local enhancement of charge (spin) order
that is absent in the original SDW (CDW) phase can be realized with proper
laser frequency and strength. The possibility of restoration of spin orders
from the CDW phase by optical means is discussed.
