报道了基于半导体可饱和吸收镜锁模的大模场面积双包层掺镱光子晶体光纤(PCF)激光器。激光器采用环形腔结构，腔内无色散补偿机理，使其工作在全正色散锁模状态，在耦合进入光子晶体光纤的功率为12.2 W时获得了脉冲宽度为3.3 ps，重复频率高达93.33 MHz的稳定锁模脉冲激光输出，中心波长为1027 nm，3 dB线宽为1 nm，在耦合进入光子晶体光纤的功率为14 W时获得最高输出功率150 mW，激光器可连续稳定工作2 h以上，没有出现失锁现象。在不同实验条件中，观察到调Q锁模和脉冲分裂现象，并分别给出了分析和解释。

A large-mode-area double-cladding Yb-doped photonic crystal fiber (PCF) mode-locked laser based on semiconductor saturable absorber mirror (SESAM) is reported. Without any pulse compression mechanism, a pulse with duration of 3.3 ps and repetition frequency of 93.33 MHz is generated in a ring cavity when the power coupling into the fiber reaches 12.2 W. The central wavelength and the spectrum bandwidth are 1027 nm and 1 nm, respectively. When the power coupling into the fiber reaches 14 W, a maximam output power of 150 mW can be achieved. The laser can work stably for 2 h. Q-switched and pulse splitting are observed and analyzed.