We present pulse characteristics and evolution processes of a Q-switched ytterbium-doped double-clad (YDDC) fiber laser. At different pump powers and repetition rates, the laser shows different pulse shapes, buildup times, and duration. Due to the self-mode-locking effect in the Q-switching process, the Q-switched pulses split up. These phenomena are analyzed and the control of Q-switched pulses is discussed.
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