Abstract
A model derived from propagation-rate equations with consideration of transverse-hole burning, the mode-coupling effect, and longitudinal-distributed loss for a laser signal is built up to describe the transverse mode competition in multimode fiber lasers. Based on the model, theoretical analysis on transverse mode competition in a partial-coiled multimode fiber laser, which introduced longitudinal-distributed loss, is presented. An experimental laser system applying this fiber is also demonstrated. To study the transverse mode competition, we changed the coiled length of the fiber and measured the output beam quality to compare with calculated values. The experimental results agree with the theoretical analysis.
Published Version
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