Open AccessMultilevel quantum interference in the formation of high-order fractional molecular alignment echoes
Author(s) -
Pu Wang,
Lixin He,
Yanqing He,
Siqi Sun,
Ruxuan Liu,
Baoning Wang,
Pengfei Lan,
Peixiang Lu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.411218
Subject(s) - interference (communication) , physics , echo (communications protocol) , excitation , quantum , optics , density matrix , quantum interference , spectroscopy , laser , statistical physics , quantum mechanics , computer science , telecommunications , computer network , channel (broadcasting)
We theoretically investigate the formation of the high-order fractional alignment echo in OCS molecule and systematically study the dependence of echo intensity on the intensities and time delay of the two excitation pulses. Our simulations reveal an intricate dependence of the intensity of high-order fractional alignment echo on the laser conditions. Based on the analysis with rotational density matrix, this intricate dependence is further demonstrated to arise from the interference of multiple quantum pathways that involve multilevel rotational transitions. Our result provides a comprehensive multilevel picture of the quantum dynamics of high-order fractional alignment echo in molecular ensembles, which will facilitate the development of "rotational echo spectroscopy."