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建立理论模型,讨论了非线性偏振旋转全光纤锁模激光器的锁模过程、谐波过程以及导致激光器锁模运行难以稳定的影响因素.讨论了采用啁啾脉冲光谱滤波产生脉冲自振幅调制、增加激光器锁模稳定性和自启动能力的机理以及非线性偏振旋转与啁啾脉冲光谱滤波相结合实现锁模的物理过程和脉冲演化过程.研制出全光纤结构的超短脉冲掺Yb~(3+)光纤环形激光器,采用非线性偏振旋转和啁啾脉冲光谱滤波相结合的锁模技术,实现了激光器锁模的开机自启动和高稳定运行.对激光器进行了长期运行稳定性、锁模开机自启动能力、锁模输出参数可重复性监测.锁模脉冲中心波长1052.9 nm,谱宽9.1 nm,脉冲能量4.25 nJ,脉冲宽度17.8 ps.运行期间,各参数波动均小于0.3%.开机自启动能力和可重复性测试显示,激光器可实现一键自启动,启动后各参数可重复精度在0.55%以内.
A theoretical model is established to discuss the mode-locking process, the harmonic process and the factors that make the laser mode-locked operation difficult to stabilize.Finally, the pulse self-amplitude modulation with chirped pulse spectral filtering is discussed, The mechanism of laser mode-locking stability and self-starting ability and the combination of nonlinear polarization rotation and chirped pulse spectral filtering are used to realize the mode-locked physical process and pulse evolution process.The ultrashort pulse doped Yb3 + ) Optical fiber ring laser, the mode locking technique combining non-linear polarization rotation and chirped pulse spectral filtering is adopted to realize the laser self-starting and high-stability operation of the laser mode locking.The long-term operation stability of the laser, The starting power and the output of the mode-locked mode are monitored repetitively.The center wavelength of the mode-locked pulse is 1052.9 nm, the spectral width is 9.1 nm, the pulse energy is 4.25 nJ and the pulse width is 17.8 ps.The fluctuation of the parameters during operation is less than 0.3% And repeatability test shows that the laser can be a key to start from start to repeat the accuracy of the parameters within 0.55%.