Abstract
We investigate theoretically the field-free molecular orientation driven by a modulated two-color laser pulse together with a delayed half-cycle THz pulse, with the LiH molecule as an example. The field-free molecular orientation and the population of the target state (v=1,J=1) are controlled by adjusting the phase of envelope ϕ and the period Tp of the modulated two-color laser field. At Tp=7ps, more molecules are populated to the target state and more efficient molecular orientation is achieved. The effect of temperature on molecular orientation is also discussed.
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