Optimization of Yb3+-doped double-clad fiber lasers using a new approximate analytical solution |
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| Authors: | Xiongyong Liao Chaohong Huang |
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| Institution: | 1. Shenzhen Key Laboratory of Laser Engineering, College of Electronic Science and Technology, Shenzhen University, ShenZhen 518060, China;2. State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fiber and Cable Company Ltd. R&D center, Wuhan 430073, China;1. Digestive Endoscopy Unit Campus Bio-Medico, University of Rome, Rome, Italy;2. Pathology Unit, A. Gemelli Catholic University of Rome, Rome, Italy;3. Faculty of Biomedical Engineering, Campus Bio-Medico, University of Rome, Rome, Italy;4. Radiology Unit, Regina Apostolorum Hospital, Albano, Italy;5. University of Florence, Electronics and Telecommunications, Florence, Italy;6. Pathology Unit, Campus Bio-Medico, University of Rome, Rome, Rome, Italy;7. Surgical Unit, Campus Bio-Medico, University of Rome, Rome, Italy;8. Digestive Endoscopy Unit, A. Gemelli Catholic University of Rome, Rome, Italy;1. Department of Applied Science, Harbin University of Science and Technology, 52 Xuefu Road, Harbin, 150080, China;2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, 52 Xuefu Road, Harbin, 150080, China;1. Ecole Nationale d’Ingénieurs de Saint-Etienne, 58 rue Jean Parot,42023 Saint-Etienne, France;2. Moscow State University of Technology “STANKIN”, Vadkovsky pereulok 3a, 127055 Moscow, Russia |
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| Abstract: | We investigated the properties of continuous wave (CW) Yb3+-doped double-clad fiber lasers (DCFLs) with linear-cavities theoretically and numerically using the rate equations. Under steady-state conditions, a new approximate analytical solution for CW Yb3+-doped double-clad fiber lasers (DCFLs) with consideration of the scattering losses were deduced. Good agreement between the proposed solution and the numerical simulation was demonstrated. Compared with the known approximate solutions published in the literature, the proposed solution has a briefer expression, higher accuracy and wider scope of application, which extends the applicable range of the analytical result to low reflective feedback mirror configurations. The solution provides a clear physical understanding of the optimal design of the CW Yb3+-doped DCFLs and can be applied to different pump and output configurations. Using the proposed solution, the optimal design of the CW Yb3+-doped DCFLs was discussed. If cavity reflectivities are given in advance, the optimal fiber length is found to be independent of the pump power. When the pump power and reflectivity of the feedback end are known in advance, the results show that the optimal fiber length increases and the optimal reflectivity of output mirror decreases with increase in pump power. Furthermore, when the feedback mirror is highly reflective, there exists a certain tolerance of the optimal parameters, in which the conversion efficiency decreases only slightly. But the conversion efficiency is sensitive to reflectivity of output mirror if feedback mirror has low reflectivity. |
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