Transparency and dressing for optical pulse pairs through a double-Λ absorbing medium

Through numerical simulations we show that the propagation of pairs of optical pulses in a double-{Λ} configuration is favorable for the attainment of electromagnetically induced transparency with matched pulses, even through a long absorbing sample. The double-{Λ} configuration allows a flexible and precise control of the amplitudes and phases for the propagating pulses. Different atomic and field configurations based on a double-{Λ} system in rubidium atoms have been explored.