| 總結: | The studies of ytterbium-doped double-clad fiber laser system that can be used to produce high power laser are comprehensively analyzed in this research. The simulation was done using Liekki commercial software application. The engine of this simulation application was based on rate equation which relates to the design parameter of the fiber laser. In order to improve the performance of Yb3+-doped double clad fiber laser, there are several critical parameters that need to be analyzed which are pump wavelength, fiber length, pump power, dopant concentration and output reflectivity, R2. The result shows pump wavelength of 976 nm presents the highest efficiency value of 84.58 % compared to 915 nm and 920 nm. It is found that dopant concentration of N= 4 x 1025 m-3 is the best choice to produce high output power. It is also found that the optimum fiber length for this work is 15.4 m which correspond to the output power of 39 W with forward pump power of Pp = 50 W. The optimum fiber length does not depend on the output reflectivity, R2 when R2 is greater than 90 %.
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