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非线性偏振旋转中偏振控制器方位角的研究
Study on wave plate angles of polarization controller in nonlinear polarization rotation mode-locked fiber laser
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摘要: 提出一种基于Jones矩阵的非线性偏振旋转锁模光纤激光器数值模型,对偏振控制器波片方位角的描述具有物理意义清晰的优点.数值仿真得到均方根宽度为0.28 ps的超短脉冲,时域对称且振幅稳定.搭建了非线性偏振旋转锁模光纤激光器,系统可以自启动,得到了重复频率为67.35 MHz的锁模脉冲输出.数值仿真和实验结果都表明偏振控制器两个波片的方位角α_1和α_2都具有周期性,周期分别为180°和90°.由于随机双折射的影响,实验测得的波片方位角调谐范围比数值仿真的结果小,这一点通过在数值仿真模型中加入随机双折射的作用而得到证明.Abstract: Based on Jones matrices, a numerical model is proposed for the simulation of nonlinear polarization rotation （NPR） mode-locked fiber lasers with the advantage of a clear physical meaning. Ultra short pulses are derived with symmetric shape, stable amplitude and a square width of 0,28 ps. A self-starting NPR mode-locked fiber laser experimental setup is established and the fundamental repetition of the pulses is 67.35 MHz. Both the numerical simulation and the experimental results indicate that the angle of the half wave plate has a period of 180° while the quarter wave plate has a period of 90°. Due to the influence of random birefringence, the tuning range of the angle of the wave plates measured in experiment is smaller than that shown in numerical simulation, which is verified by adding the effect of random birefringence in numerical simulation.
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