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Laser Physics Letters

Spatially control of dispersion in a three-level assisted optomechanical system

Bin Xiao, Yan Huang

Published Apr 1, 2026• 0 citations
Publisher

Abstract

Abstract In this letter, we propose a new model based on an optomechanical system to control the spatial properties of the dispersion spectrum of a weak cavity field. The optomechanical cavity consists of a three-level atomic system with ladder-type configuration. The atomic system interacts with the composite vortex light and a weak cavity field. The composite vortex light carries an orbital angular momentum (OAM), which can be used to adjust the spatial properties of the medium. We found that by controlling the OAM number of the composite vortex light, the spatial pattern of the dispersion spectrum can be controlled in different regions of space. By adjusting the dispersive control of the medium, the refraction and group indices can be optimized for application in quantum information processing.

DOI
10.1088/1612-202x/ae4f87

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We propose a scheme to map atoms via the coherence superpositions of orbital angular momentum (OAM) light. The atoms are prepared in the four-level tripod configuration in the presence of a vortex light, which coherently superposes two Laguerre-Gaussian (LG) beam modes with equal but opposite OAM. Because of the spatially dependent atom-field interaction, the information about the position of the atom can be obtained via the absorption measurement of the weak probe field. It is found that the absorption behavior is significantly impacted by the detuning, control field, azimuthal number, and radial number. Most importantly, atomic mapping accuracy can be controlled by properly adjusting the detunings and control field. The coherent interaction of OAM light with atoms constitutes a platform for active mapping of atoms at specific positions in azimuthal space.