Collection Of theses on high power laser and plasma physics, 2005, 3 (1): 873, Published Online: Jun. 1, 2007  

Study of Self Mode-Locking in Q-Switched and Continuous Working Yb-Doped Fiber Laser

Author Affiliations
1 中国科学院上海光学精密机械研究所,上海 201800
2 中国科学院研究生院,北京 100039
3 上海理工大学理学院物理系,上海 200093
Abstract
A clear and stable self mode-locked pulse train was observed with Q-switched pulse envelope in diode pumped Yb-doped Q-switched fiber lasers. Self phase modulation (SPM) is regarded as the main reason to generate mode-locked pulses in this Q-switched fiber laser. The main effect of SPM is to broaden the spectrum of the optical pulses. If the width of the broadened spectrum is comparable with the cavity-mode spacing then the modes can interact with each other, and a fixed-phase relationship between different oscillating axial modes is maintained, resulting in the mode-locked operation. On this basis, the acousto-optic modulator (AOM) was removed and two gratings were used as the cavity mirrors, and an all-fiber Fabry-Perot (F-P) cavity fiber laser was realized. Similar mode-locked pulses were observed when using two ring reflectors as the cavity mirrors. It is observed that mode-locking has close relations with fiber length, Yb-doped concentration and pump power. Such kind of lasers provide a new method to generate mode-locked pulses.

Xiaoxing Feng, Bai Chen, Yi Zhu, Jialin Chen, Liping Liang, Zunqi Lin. Study of Self Mode-Locking in Q-Switched and Continuous Working Yb-Doped Fiber Laser[J]. Collection Of theses on high power laser and plasma physics, 2005, 3(1): 873.

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