Conservation of orbital angular momentum via four-wave mixing in cesium vapor

Yanpu Chen; Zeyan Zhang; Kexin Liu; Jizhou Wu; Yuqing Li; Wenliang Liu; Vladimir Sovkov; Liantuan Xiao; Suotang Jia; Jie Ma

doi:10.1103/54c8-sb6l

Conservation of orbital angular momentum via four-wave mixing in cesium vapor

Yanpu Chen^1,*, Zeyan Zhang^1,*, Kexin Liu¹, Jizhou Wu ^1,2,3,4,†, Yuqing Li^1,2,4, Wenliang Liu^1,2, Vladimir Sovkov ^1,3,5, Liantuan Xiao^1,2, Suotang Jia^1,2 et al.

Jie Ma ^1,2,3,4,‡

¹State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy, Shanxi University, 92 Wucheng Road, Taiyuan 030006, China
²Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
³College of Physical and Electronic Engineering, Shanxi University, Taiyuan 030006, China
⁴Hefei National Laboratory, Hefei 230088, China
⁵St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia

^*These authors contributed equally to this work.
^†Contact author: wujz@sxu.edu.cn
^‡Contact author: mj@sxu.edu.cn

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Phys. Rev. Applied 23, 064060 – Published 26 June, 2025

DOI: https://doi.org/10.1103/54c8-sb6l

Abstract

The intricate interplay between Laguerre-Gauss beams (LGBs) carrying orbital angular momentum (OAM) and atomic systems has emerged as a fascinating area of research in quantum optics and quantum information science. These LGBs have proven to be invaluable tools for advancing optical manipulation, information processing, imaging technologies, and communication systems. In the present investigation, we explore two near-infrared pump vortex beams of Laguerre-Gaussian mode, each characterized by distinct azimuthal indices $l_{1}$ and $l_{2}$ , representing their respective topological charges. Through meticulous observation of the blue vortex beam generated under dual-wavelength condition in the four-wave-mixing process, we successfully demonstrate and verify OAM conversions, thereby providing compelling evidence for the conservation of OAM. The findings from this study hold significant promise for applications in spatial optical communication multiplexing technology, potentially revolutionizing transmission capacity in future communication systems.

Physical Review Applied

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Conservation of orbital angular momentum via four-wave mixing in cesium vapor

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Conservation of orbital angular momentum via four-wave mixing in cesium vapor

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