Abstract
We theoretically show that the field-free molecular orientation induced by the combined electrostatic and laser fields can be manipulated through shaping the femtosecond laser pulse with periodic phase step modulation. By adjusting the modulation time τ or the modulation depth δ, the maximum degree of the molecular orientation can be fully suppressed or reconstructed by the combined electrostatic and the transform-limited laser fields. The relations between the maximum degree of the field-free molecular orientation and the laser intensity, the amplitude of the electrostatic field, as well as the rotational temperature are also investigated.
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