Characteristics of pulse evolution in mode-locked thulium-doped fiber laser |
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| Authors: | Ying An Deyuan Shen Wei Zhao Jingyu Long |
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| Institution: | 1. State Key Laboratory of Transient Optics and Photonics, Xi''an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi''an 710119, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Science, Shanghai Institute of Technology, Shanghai 201418, China;2. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;3. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;1. Institute of Laser for Postgraduate Studies, University of Baghdad, Baghdad, Iraq;2. Laser and Optoelectronics Department, College of Engineering, Al-Nahrain University, Baghdad, Iraq;1. Dream Institute of Technology, P.O. Bishnupur, Samali, 24 Parganas(S), Kolkata, India;2. Department of Electronic Science, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India;1. School of Science, Shanghai Institute of Technology, Shanghai 201418, China;2. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;3. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China |
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| Abstract: | We have numerically investigated the characteristics of the pulse evolution in a passively mode-locked thulium-doped fiber laser with net anomalous cavity dispersion. For the fixed resonator configuration, single-, dual-, triple-, and quadruple-pulses are generated successively by enhancing the pump power or reducing the output ratio. The characteristics of the single or multiple pulses are investigated with various cavity lengths. The separation between the two coexisting pulses changes with the pump power due to the interaction between the soliton and the dispersive waves, and then the two randomly distributed pulses could finally evolve into a soliton pair with fixed separation. According to the results of the numerical simulation, the multiple pulses are found to be generated via pulse splitting and the pulse splitting threshold decreases with the increase of the cavity length. |
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