The effect of field modulation on the vibrational population of the photoassociated NaK and its dynamics**Project supported by the National Natural Science Foundation of China (Grant No. 11674198) and the Natural Science Foundations of Shandong Province, China (Grant Nos. ZR2014AM022 and ZR2015AL023). Partial financial support from Taishan Scholar Project of Shandong Province is also acknowledged.

Abstract

This paper presents calculation results for the photoassociation of a NaK molecule with a two-color modulated laser and gives a detailed analysis about them. For the two-step photoassociation process in intense fields, the effect of two-color modulated laser parameters, such as relative phase, envelope period, and laser intensity, on the population of the molecular electronic state can be obtained by solving the time-dependent Schrödinger equation through the quantum wave packet method. The numerical simulation shows not only that the influence of laser parameters on the vibrational distribution presents some regularity, but also that a higher population in the ground electronic state can be realized through adjusting these laser parameters.