Abstract
Based on the simplified model of spectral beam combining system with external cavity, the changes of the combined powers and efficiencies with different design parameters were analyzed in detail. We have presented an approach of determining single-mode output power for Large-mode-area fiber laser and further built the experimental setups including single fiber laser with an external cavity, tunable fiber laser, as well as spectral beam combining of two fiber emitters. The simulation gives the ultimate combining efficiency of the combining system of no more than 82%, and meanwhile the measured efficiency was about 64.3% according to the presented method.
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