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报道了一种工作于1μm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976nm半导体激光器抽运,当抽运功率大于16dBm时,激光器可实现1033～1069nm波长范围内重复频率为25.4MHz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1064nm时,用单通道光栅对将谱宽为1.745nm、时域脉宽为34.85ps的脉冲压缩至15.45ps。
A passive mode-locked fiber laser based on semiconductor saturable absorption mirror (SESAM) is reported in the 1 μm band and normal dispersion region. High-doped laser Yb fiber gain material, combined with tunable filter, the formation of annular cavity structure. When the pump power is greater than 16dBm, the laser can achieve broadband tunable output with repetition frequency of 25.4MHz in 1033 ~ 1069nm wavelength range with stable performance and very regular rectangle can be observed within the tuning range Output spectrum. In the fixed pumping power, the output power in the tuning range, spectral bandwidth, time-domain pulse width were measured and analyzed experimentally. At a wavelength of 1064nm, a single-channel grating is used to compress a pulse with a spectral width of 1.745nm and a temporal pulse width of 34.85ps to 15.45ps.