Dynamic Alignment of D₂ Enhanced by Two Few-cycle Pulses

Dynamic alignment of D2 induced by two few-cycle pulses was investigated by solving the time-dependent Schr?odinger equation numerically based on a rigid rotor model. The results show that alignment of D2 can be enhanced by two few-cycle pulses compared with the level achievable by a single few-cycle pulse as long as the time delay between two pulses is chosen properly, and the pulse duration of two lasers plays an important role in the aligning process of D2 molecules.