Optical vortex transfer and dispersion-controlled light propagation in an Er³⁺: YAG three-level quantum system
We investigate coherent orbital-angular-momentum (OAM) transfer and dispersion-controlled light propagation in a ladder-type Er³⁺: YAG three-level system. Using the density-matrix formalism and coupled Maxwell–Bloch equations, we derive analytical expressions for the probe and generated beams that explicitly incorporate Er³⁺-ion concentration. We show that an incident vortex-carrying probe beam transfers its OAM to a generated signal beam through a concentration-dependent sum
Researchers have demonstrated the transfer of orbital angular momentum (OAM) from one light beam to another within a specific type of crystal, Er³⁺: YAG. This process involves a nonlinear interaction where the OAM is passed along while preserving its properties. The efficiency of this vortex transfer is influenced by the concentration of erbium ions in the crystal, with an optimal concentration of 3% identified for maximum efficiency.
Additionally, the study reveals that the crystal can control the speed at which light propagates, allowing for transitions between fast and slow light regimes based on the erbium ion concentration. This control over light propagation and OAM transfer makes the Er³⁺: YAG system a promising platform for advanced optical technologies.
This research offers a solid-state method for manipulating structured light, which could advance technologies in optical communication and signal processing.
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