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We have demonstrated that near complete coherence can be achieved in a fourlevel double lambda-like systems using a train of ultra-short optical pulses.The effect of the Doppler broadening has been analyzed and a scheme has beenproposed for establishing high and uniform coherence across different velocitygroups in the atomic ensemble. We have also presented a novel scheme ofexcitation using chirped pulses and shown that in addition to generatingcoherence in the system it is possible to alter the translational states of theatoms.

Coherent manipulation of four-level double lambda-like atomic system by a train of ultra-short few-cycle-optical pulses