利用飞秒激光脉冲相位整形技术，从理论和实验两方面，对强激光场下分子体系苝溶液中非共振双光子跃迁的相干控制进行了研究。通过对飞秒激光脉冲进行π相位扫描和余弦相位调制，发现分子体系中非共振双光子的跃迁几率能够被削弱，但不能完全消除。分子体系中非共振双光子跃迁的相干控制受到激光光场的形状和分子吸收谱谱宽的影响；与原子体系相比，分子体系中非共振双光子跃迁相干控制的调制效率降低。

With femtosecond laser pulse shaping technique, the coherent control of non-resonant two-photon transition in a molecular system (perylene dissolved in chloroform solution) is studied theoretically and experimentally. The femtosecond pulse is shaped with simple phase patterns (cosinusoidal and π phase step-function shapes) and it is found that the two-photon transition probability in molecular systems can be reduced but cannot be eliminated. Coherent control of non-resonant two-photon transition in a molecular system is correlated with both the laser field and the molecular absorption bandwidth. In contrast with atomic system, control efficiency of two-photon transition in molecular systems is reduced.