  We propose a method to improve the stimulated Raman adiabatic passage
(STIRAP) via dissipative quantum dynamics, taking into account the dephasing
effects. Fast and robust population transfer can be obtained with the scheme by
the designed pulses and detuning, even though the initial state of the system
is imperfect. With a concrete three-level system as an example, the influences
of the imperfect initial state, variations in the control parameters, and
various dissipation effects are discussed in detail. The numerical simulation
shows that the scheme is insensitive to moderate fluctuations of experimental
parameters and the relatively large dissipation effects of the excited state.
Furthermore, the dominant dissipative factors, namely, the dephasing effects of
the ground states and the imperfect initial state are no longer undesirable, in
fact, they are the important resources to the scheme. Therefore, the scheme
could provide more choices for the realization of the complete population
transfer in the strong dissipative fields
