Topological Charge Tunable High‐Purity Vortex Fiber Laser

ABSTRACT This work presents a Talbot‐effect‐based approach for generating high‐purity vortex lasers with dynamically tunable topological charges ( l = −3 to +3) in large‐mode‐area fibers. The vortex laser demonstrates exceptional operational stability with more than 94% mode purity while supporting fast topological charge reconfiguration with mode establishment times of sub‐8 ms, which is a critical capability for real‐time optical encoding applications. By precisely engineering phase‐dependent mode losses and exploiting the self‐reconstruction properties of Talbot diffraction, our approach achieves reliable modulation of competing modes without the need for additional optical components. The generated vortex beams exhibit robust stability, repeatability, and scalability, with topological charges reconfigured via controlled phase modulation. Through information encoding in mutually orthogonal charge states, this work demonstrates robust, multichannel communication with inherent error resilience, highlighting the vortex laser's potential for high‐speed optical links and quantum communication. By integrating active amplification with external mode shaping, it establishes a versatile and scalable platform for advanced structured light applications.