关键词: 激光技术；双波长自相似抛物线脉冲激光器；分步傅里叶方法；掺镱增益光纤；多模光纤布拉格光栅

Abstract: A switchable high power dual-wavelength self-similar parabolic pulse laser is proposed based on normal dispersion single-mode fiber,Yb3+ doped gain fiber and multimode fiber Bragg grating. The transmission and evolution of dual-wavelength self-similar parabolic pulse is simulated numerically by split-step Fourier method with the nonlinear Schr?dinger equations. The input pulses produce self-similar parabolic pulses in normal dispersion single-mode fiber and Yb3+ doped gain fiber. The dual-wavelength selection is carried out by a multimode fiber Bragg grating for laser. The dual-wavelength stable operation is realized by adjusting the polarization controller. Numerical simulations show that the operation of the laser is feasible and effective.

Key words: high power，self-similar parabolic pulse, dual-wavelength laser，Yb3+ doped gain fiber，Bragg grating formed in multimode fiber