Abstract: The effect of laser pulse width, intensity and rotational temperature on the alignment of N2O molecules by a femtosecond one-color single laser pulse is studied theoretically. We investigate the influences of free parameters on the alignment of N2O molecules in laser field for three cases. 1) Only change the laser wavelength while the laser intensity and temperature keep constant; 2) only change the laser intensity while the laser wavelength and temperature keep constant; 3) only change the temperature while the laser wavelength and laser intensity keep constant. We find that the enhancement or suppression of the molecular alignment can be coherently manipulated by precisely controlling the laser wavelength and intensity of the femtosecond one-color single laser pulse and the rotational temperature.

Key words: alignment