Field-free orientation of CO by a terahertz few-cycle pulse

The field-free molecular orientation of CO by a terahertz few-cycle pulse was studied theoretically. The effects of the laser intensity and pulse duration on the molecular orientation, which is created by the terahertz few-cycle pulse, were discussed. Furthermore, it was shown that the enhancement or suppression of the molecular orientation can be coherently manipulated by precisely controlling the carrier-envelope phase of the terahertz few-cycle pulse. Compared with other orientation techniques, better orientation can be achieved by a terahertz few-cycle pulse at lower intensities.