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Updated: Jan 15, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Published on: August 12, 2013

Modulation of spatial Raman gain induced by Laguerre-Gaussian vortex beams.

Ming Qi¹, Zhenxing Fu¹

¹College of Physics and Information Technology, Ningxia Normal University, Guyuan 756000, Ningxia, China. zxfucn@163.com.

Physical Chemistry Chemical Physics : PCCP

|January 14, 2026

Summary

Structured light, using Laguerre-Gaussian beams, precisely controls spatial Raman gain in a closed-loop system. This research offers new insights for designing photonic devices and achieving spatially selective amplification.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Optics
Nonlinear Optics

Background:

Electromagnetically induced transparency (EIT) enables coherent control of optical properties in atomic media.
Previous studies focused on open-loop configurations for optical gain.

Purpose of the Study:

Investigate spatial modulation of Raman gain using structured light in a microwave-assisted closed-loop three-level system.
Analyze the influence of Laguerre-Gaussian (LG) beam parameters on Raman gain distribution.

Main Methods:

Employed a density-matrix approach for numerical simulations.
Calculated two-dimensional Raman gain maps and cross-sectional profiles.
Utilized a closed-loop three-level system driven by LG control and Gaussian probe fields.

Main Results:

Orbital angular momentum (OAM) of the LG beam dictates single-lobe to multi-lobe gain structures.
Single-photon detuning and relative phase of control fields influence gain magnitude and spatial complexity.
Relative phase induces rotational or mirror-symmetric transformations in the gain profile.

Conclusions:

Demonstrated structured light's capability to tailor nonlinear gain processes in a closed-loop system.
Extended theoretical understanding beyond previous open-loop EIT studies.
Provided insights for spatially selective amplification and structured-light-based photonic device design.