报道了一种工作于1 μm波段、正常色散区、基于半导体可饱和吸收镜(SESAM)的被动锁模光纤激光器。激光器以高掺杂Yb光纤为增益物质，结合可调谐滤波器，形成环形腔结构。采用976 nm半导体激光器抽运，当抽运功率大于16 dBm时，激光器可实现1033~1069 nm波长范围内重复频率为25.4 MHz的宽带可调谐输出，性能稳定，在调谐范围内均可观测到非常规则的矩形输出光谱。在固定抽运功率下，对调谐范围内输出功率、光谱带宽、时域脉宽进行了实验测量和分析。在波长为1064 nm时，用单通道光栅对将谱宽为1.745 nm、时域脉宽为34.85 ps的脉冲压缩至15.45 ps。

Based on a semiconductor saturable absorber mirror (SESAM), an all-normal-dispersion ring cavity, tunable, ytterbium-doped passively mode-locked fiber ring laser is reported. Pumped by a 976 nm semiconductor laser, when the pumping power is more than 16 dBm, the fiber laser can realize tunnable output from 1033 nm to 1069 nm smoothly at a repetition rate of 25.4 MHz, and a regularly rectangular spectrum is produced. The dependence of output power, bandwidth, and domain pulse-width on wavelength is analyzed in detail at a fixed pumping power. The experimental setup is compact and self-started. In addition, the output pulse, with a spectrum width of 1.745 nm and time domain width of 34.85 ps at 1064 nm, is compressed to 15.45 ps by using single-channel grating pairs.