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基于正色散单模光纤、掺Yb~(3+)增益光纤和多模光纤光栅,提出了一种可调高功率双波长自相似抛物线脉冲激光器。采用非线性薛定谔方程描述双波长自相似抛物线脉冲的传输和演化过程,并利用分步傅里叶方法进行数值模拟。输入脉冲在正色散单模光纤与掺镱增益光纤中产生自相似抛物线脉冲,多模光纤布拉格光栅对激光器进行双波长选择,通过调节偏振控制器实现双波长稳定运行。数值模拟分析结果表明该激光器的运行是可行且有效的。
Based on positive dispersion single mode fiber, Yb ~ (3+) gain fiber and multimode fiber grating, a tunable high power dual wavelength self-similar parabolic pulse laser is proposed. The nonlinear Schrodinger equation is used to describe the propagation and evolution of dual-wavelength self-similar parabolic pulses and the numerical simulation is carried out by using the split-step Fourier method. The input pulse produces self-similar parabolic pulses in the positive dispersion single-mode fiber and the ytterbium-doped gain fiber. The multi-mode fiber Bragg grating selects the dual wavelength of the laser and the dual wavelength stabilization operation is achieved by adjusting the polarization controller. Numerical simulation results show that the laser operation is feasible and effective.