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设计了一种能够输出超短脉冲作为激光种子源的全光纤掺镱被动锁模光纤激光器,并对其进行了数值仿真。为了得到满足设计要求的超短脉冲,使用了被动锁模技术和色散补偿技术。利用非线性偏振旋转技术实现被动锁模,并在环形腔中引入全固态光子带隙光纤对腔中的正色散进行补偿。通过仿真及优化,获得了脉宽为0.7ps,能量为0.89nJ的脉冲序列。仿真结果表明,使用被动锁模技术和色散补偿技术有利于得到满足作为激光种子源设计要求的超短脉冲。
An all-fiber Yb-doped passively mode-locked fiber laser capable of outputting ultrashort pulses as a laser seed source is designed and numerically simulated. In order to get ultrashort pulses that meet the design requirements, passive mode-locking and dispersion compensation techniques are used. The passive mode-locking is achieved by the non-linear polarization rotation technique, and the all-solid photonic band gap fiber is introduced into the annular cavity to compensate the positive dispersion in the cavity. Through simulation and optimization, a pulse sequence with a pulse width of 0.7 ps and an energy of 0.89 nJ was obtained. The simulation results show that the use of passive mode-locking technique and dispersion compensation technique are favorable to meet the ultra-short pulse that meets the design requirements of laser seed source.