Abstract

The spindle-shaped fiber is a novel fiber with a gradual longitudinal structure. The small size section and large size section have the advantages of controlling the number of modes and reducing the laser power density respectively. Based on the steady-state rate equations and coupled mode theory of fiber lasers, this paper conducts theoretical research and comparative analysis on SRS and mode evolution in fiber lasers based on conventional fibers and spindle-shaped fibers, respectively. The results show that, compared with conventional fibers with the similar core diameter, the spindle-shaped fiber can effectively balance the mitigation of SRS and TMI in fiber lasers, and has great potential for achieving higher power laser with better beam quality.

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