Enhancement of molecular field-free orientation by utilizing a modulated two-color laser field

► A modulated two-color laser (MTCL) is used to enhance the field-free orientation. ► LiH molecules are oriented by MTCL together with delayed half-cycle THz pulse. ► Maximum of orientation degree changes periodically with the phase of envelope of MTCL. ► The phase and period of MTCL has some influence on molecular orientation.