Dynamical analysis of the effect of super-Gaussian laser pulses on molecular orientation

Abstract

In this paper, through the investigation of the field-free orientation dynamics driven by super-Gaussian laser pulses using a quantum mechanics method, we show that compared with the molecular orientation driven by Gaussian laser pulses, it is hard for super-Gaussian laser-induced orientation to reach the purely adiabatic regime at the same pulse duration. By analyzing the varying of the maximal orientation degree with the pulse, it is found not only that using super-Gaussian laser pulses can give us more pulse durations to choose from for field-free molecular orientation, but that increasing the shape parameter N and choosing an appropriate electric field intensity can also be beneficial to enhance the orientation degree. The temperature effect on the maximal orientation degree is also discussed, and the super-Gaussian laser pulse is found to be more feasible at higher temperatures.