高功率线偏振皮秒脉冲激光光源在工业加工、相干光束合成和非线性光学等领域有广泛的应用。报道了基于半导体可饱和吸收镜锁模的高功率线偏振皮秒脉冲掺镱全光纤激光器。激光器采用两级主振荡功率放大(MOPA)结构。种子源采用环形腔结构，在抽运功率为200 mW时，获得了重复频率为40 MHz、脉冲宽度为20 ps的锁模脉冲输出，平均输出功率为12 mW，中心波长为1038.2 nm，光谱宽度为1.7 nm，光谱明显的陡沿结构表明在全正色散光纤激光器中形成了耗散孤子。经过两级双包层保偏掺镱光纤放大器，获得了平均功率为5 W的输出，相应的单脉冲能量和峰值功率分别为125 nJ和6.25 kW。在最大输出功率时，没有出现受激拉曼散射等非线性现象，此时激光脉冲光谱宽度为3.1 nm，脉冲宽度为20 ps，偏振消光比为20 dB。

High average power linearly-polorized picosecond pulsed laser sources have a wide range of applications in the fields of industrial material processing, coherent beam combination and nonlinear optics. A high power linearly polarized picosecond pulse ytterbium-doped all-fiber laser based on a seed of mode-locked fiber laser with a semiconductor saturable absorber mirror is reported. The fiber laser is constructed with a two-stage master oscillator power amplifier (MOPA) configuration. Stable mode-locked pulse train occurs when the incident pump power increasing and the pulse repetition rate is 40 MHz in a ring cavity configuration. Increasing the incident pump power to 200 mW, the maximum output average power is 12 mW. The pulse width is measured to be 20 ps. The center wavelength and the spectrum bandwidth are 1038.2 nm and 1.7 nm, respectively. The steep edge in the optical spectrum is a clear indication of the dissipative solitons (DSs) in this all-normal-dispersion mode-locked fiber laser. After two-stage fiber amplifier with the polarization maintaining double-cladding ytterbium-doped fiber as the gain medium, 5 W average output power is achieved, corresponding to a single pulse energy of 125 nJ and a peak power of 6.25 kW, respectively. No undesirable nonlinear processes such as stimulated Raman scattering are observed. At this high output power, the spectrum bandwidth and the pulse width are measured to be 3.1 nm and 20 ps, respectively, and the polarization extinction ratio is 20 dB.