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4. Dong Hou, Bo Ning, Peng Li, Zhigang Zhang, Jianye Zhao, “Modeling analysis for phase-locking of a mode-locked laser,” IEEE J. Quantum Electron. 47, 891–898 (2011).
5. Aimin Wang, Hongyu Yang, Zhigang Zhang, “503MHz repetition rate femtosecond Yb:fiber ring laser with an integrated WDM collimator,” Opt. Express 19, 25412-25417 (2011).