Pulse shape effect of delayed pulse on non-adiabatic rotational excitation

We examine the time evolution of Non-adiabatic excitation of polar molecule in static field exposed to a combination of delayed pulses. The delayed pulse pair consists of half cycle pulse (HCP) and an another delayed pulse (either ultrashort half cycle pulse or zero area pulse). We describe how Non-adiabatic rotational excitation (NAREX) due to Gaussian HCP pulse alone can be greatly modified by applying ultrashort HCP/zero area pulse. It is also shown that non-adiabatic rotational excitation can be controlled by various laser parameters, out of which pulse shape plays the most significant role for controlling the dynamics. Time dependent Schrödinger equation (TDSE) of NAREX dynamics, are studied using efficient fourth order Runge Kutta method.

Time evolution of the rotational state distribution calculated at static field intensity of 5 kV/cm. Here the pulse duration (tp) of initial pulse is 0.5 ps and the delayed pulse of two different shapes (shown in inset) is applied at tc/2tc/2.Figure optionsDownload as PowerPoint slideHighlights
► NAREX in presence of delayed pulse.
► Variation of transition probabilities with pulse shape of delayed pulse.
► Effect of delay time and pulse width of initial HCP.