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Numerical analysis and experimental results of output performance for Nd-doped double-clad fiber lasers |
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| Authors: | Nam Seong Kim Toshihiro Hamada Mahendra Prabhu Cheng Li Jie Song Ken-ichi Ueda Anping Liu Hong Jin Kong |
| Affiliation: | a Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan b Information and Telecommunications Technology Center, The University of Kansas, Lawrence, KA 660047, USA c Department of Physics, Korea Advanced Institute of Science and Technology, Yusong-gu, Taejon 305-701, South Korea |
| Abstract: | Numerical analysis is investigated for the high-power double-clad fiber lasers and experimental results using different microscope objectives for focusing into a Nd-doped rectangular double-clad fiber also performed. The numerical analysis includes dependence of output power on output mirror reflectivity, absorbed pump power, loss, and fiber length and pump power distribution for the cases of one-end and two-end pumps with 20 dB/km loss. Calculated conversion efficiencies are 76.36%, 69.73%, and 63.84% for lossless, two-end pump, and one-end pump fiber lasers, respectively. Slope efficiencies from absorbed pump power/output powers measured using microscope objectives are 16.8%/182 mW, 53.8%/351 mW, 24.9%/1240 mW, and 13.9%/649 mW for magnifications of 5×, 10×, 20×, and 40×, respectively. |
| Keywords: | Fiber laser Diode-pumped lasers Design of specific laser systems High-power fiber laser Double-clad fiber laser |
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