By the ray tracing in the channel waveguide, the dependency of the launching efficiency on the relative position of the pumping beam to the waveguide is analyzed and the coupling conditions are optimized.

• 通过几何光学法追迹泵浦光线在波导中的传播，系统地分析了泵浦光束与波导相对位置变化对泵浦耦合效率的影响，进而确定最佳耦合条件。