为了实现高重复频率和高功率的光脉冲,实验采用Er3+/yb3+共掺双包层光纤作为增益介质,稳定的中心波长为976 nm的高功率半导体激光器作为泵浦源,利用非线性偏振旋转锁模技术,得到稳定的自起振锁模光脉冲.当泵浦功率为2.4W时,激光器输出重复频率为8.829 MHz的连续锁模光脉冲,平均输出功率为52.5 mW,自起振锁模泵浦阈值功率为0.6W,并观测到了稳定的高阶谐波锁模、调Q和调Q-锁模光脉冲输出.%The passive harmonically mode-locked fiber ring laser with a small segment of Er3+ /Yb3+ codoped double-clad fiber as gain medium, which is pumped by 976 nm LD laser and mode-locked exploiting the nonlinear polarization rotation technique, was successfully demonstrated for the generation of self-starting mode-locked pulses. When the laser was pumped at 2. 4 W, stable mode-locked pulses were obtained at the repetition rate of 8. 829 MHz through modulating the fiber polarization controllers. The average output power of the fiber laser was 52. 5 mW, and the threshold power of the self-starting mode-locked pumping is 0. 6 W. The high-order mode-locked, Q-switched and Q-switched-mode-locked pulses were also observed experimentally.
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