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讨论了自启动被动锁模掺Yb3+光纤环形激光器产生短脉冲的机理,并研制出全光纤结构超短脉冲掺Yb3+光纤环形激光器.采用两个976nm半导体激光器级联抽运作为抽运源,高掺杂浓度掺Yb3+光纤作为增益介质,利用光纤的非线性偏振旋转效应,得到自启动、十分稳定的ps量级锁模光脉冲.激光器锁模阈值功率260mW,输出功率25mW,锁模光脉冲中心波长1056nm,3dB带宽11·7nm,重复频率20MHz.与其他结构光纤激光器相比,这种全光纤结构具有更高的效率和更好的稳定性.
The mechanism of short pulses generated by passive mode-locked Yb3 + fiber ring lasers was discussed and an all-fiber structure ultrashort pulse Yb3 + fiber ring laser was developed. Two 976nm laser cascades were used as pumping source, Doped Yb3 + fiber as the gain medium, a self-starting and very stable PS-order mode-locked optical pulse was obtained by using the non-linear polarization rotation effect of the optical fiber.The laser mode-locked threshold power of 260mW, output power of 25mW, mode-locked pulse center wavelength 1056nm, 3dB bandwidth 11.7nm, repetition frequency 20MHz. Compared with other structured fiber lasers, this all-fiber structure has higher efficiency and better stability.