Photoassociation dynamics driven by a modulated two-color laser field

Abstract

Photoassociation (PA) dynamics of ultracold cesium atoms steered by a modulated two-color laser fieldis investigated theoretically by numerically solving the time-dependent Schrödinger equation. The PA dynamics is sensitive to the phase of envelope (POE) φ and the period of the envelope T p , which indicates that it can be controlled by varying POE φ and period T p . Moreover, we introduce the time-and frequency-resolved spectrum to illustrate how the POE φ and the period T p influence the intensity distribution of the modulated laser pulse and hence change the time-dependent population distribution of photoassociated molecules. When the Gaussian envelope contains a few oscillations, the PA efficiency is also dependent on POE φ. The modulated two-color laser field is available in the current experiment based on laser mode-lock technology.

Robust control of photoassociation of slow O + H collision

“…The step size η of the optimal control algorithm is set as 11.0. In order to demonstrate the optimal field in both the time and frequency domains, we introduce a windowed-fourier transform [48,49]…”

Effects of an electric field on Feshbach resonances and the thermal-average scattering rate of6Li-40K collisions

“…ν dR is defined as the transition factor from |l to |l ′ in this paper. Since it depends on interatomic distance R, the eigenfunctions of bound state {ψ Sl ν } need to be pre-calculated by using the mapped Fourier grid method [17][18][19]. The coupling between electric field and dipole moment depends on the angle χ between them, i.e.,ê ζ •ê d = cos χ.…”

Theoretical simulation of the photoassociation process for NaCs

“…[19,20] In 2012, Lin Feng and Zhang Wei et al studied the dependence of photoassociation probability on the cut-off position of the laser pulse. [21] Here, we study the two-step association process of the NaCs with the time-dependent quantum wave packet method which has been proved to be an effective and accurate method to investigate the interaction between molecules and an external field. [22][23][24][25][26] We choose NaCs for two reasons.…”