Effect of phase coherence on population transfer in three harmonic laser pulses

Abstract

The population transfer controlled by fundamental, 2nd-harmonic and 3rd-harmonic pulses is investigated by using the time-dependent quantum wave packet method. By varying the phase of the fundamental pulse, it can be coherent with the 2nd-harmonic and 3rd-harmonic pulses. Compared with two harmonic pulses, the phase in three harmonic pulses is more efficient in controlling population transfer. Molecular orientation can be controlled by the phases of the three pulses. The value of molecular orientation mainly depends on the phase coherence between the fundamental and 2nd-harmonic pulses.

Characterization of the periodic dissociation process of the NaI molecule

“…The wave function and the Hamiltonian are represented on an equally spaced grid of 4196 points with 1.5 < R < 40Å. The time propagation of nuclear wave packet can be accomplished by using the split operator method [38][39][40]. The KER spectra can be obtained by Fourier transformation of the dissociative wave function component as a function of R outside the cutoff internuclear distance of R cut = 8.0Å, i.e., for R > R cut [41].…”

The role of geometric phase in dissociation dynamics of the molecule

“…The nuclear wavefunction is calculated by numerically solving Equation (1) using the discrete variable representation and split-operator method [50][51][52][53][54]. Moreover, the wavefunction is multiplied by an absorption function to avoid the unphysical reflection of wave packet at the boundary [55].…”