Abstract
The authors report for the first time clear and stable self mode-locked pulses with Q-switched pulse envelope in diode pumped Yb-doped Q-switched fiber lasers. Self Phase Modulation (SPM) effect is used to explain the generation of self mode-locking. On this basis, the AOM was removed and two gratings were used as the cavity mirrors. An all-fiber F-P cavity mode-locked fiber laser was realized for the first time. Similar mode-locked pulses were observed when using two ring reflectors as the cavity mirrors. SPM effect combining with saturable absorption effect is proposed as an explanation. The all-fiber F-P cavity fiber laser provides a new method to generate mode-locked pulses.
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