Abstract
As heat sources in the fiber laser system, fusion points are among the most vulnerable parts in high power fiber lasers (HPFLs). A model is built to evaluate the heat induced by fusion splices quantitatively. By introducing the splice thermogenic factor (STF), the temperature of a fusion point is obtained at different output powers. At the same time, a real-time in-situ temperature measurement experiment is carried out, and the actual STF value of 0.449 ppm is obtained by fitting the model parameters with the experimental results. The fitting results indicate that the STF can evaluate the heat characteristics of fusion splices quantitatively and predict the temperature rise. The model can pave the way for further power scalability of HPFLs.
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