论文部分内容阅读
针对基于重叠因子模型的速率方程不能分析粒子数空间分布的情况,依据双包层掺Yb3+光纤激光器中,内包层光强近似于均匀分布、而纤芯中光场近似于高斯分布的特点,建立了基于光强分布的速率方程。依据该方程,分析了正向、反向和双向泵浦方式下,Yb3+上能级粒子数的空间分布。结果表明:沿光纤轴向,不同的泵浦方式导致上能级粒子数呈现不同的分布特征;而沿光纤径向,无论采用何种泵浦方式,上能级粒子数都呈现中间低、两端高的抛物线分布结构。
In view of the fact that the rate equation based on the overlap factor model can not analyze the spatial distribution of the number of particles, the light intensity in the cladding is approximately uniform and the optical field in the core approximates the Gaussian distribution in the double-clad Yb3 + -doped fiber laser Based on the rate of light intensity distribution equation. According to the equation, the spatial distribution of energy level particles in Yb3 + is analyzed in forward, backward and bidirectional pumping modes. The results show that the number of upper level particles shows different distribution along the axial direction of the fiber, and the number of upper level particles appears low in both directions along the fiber axis. High parabolic distribution structure.