Based on the simple and effective modle of Raman fiber amplifier, Raman gains under different parameters are computed with the help of average power and shooting method. 摘要借助简化的拉曼光纤放大器数学模型，利用平均功率法和打靶法分别计算出了不同参数下多波长泵浦的拉曼增益。
The encircled-power method is introduced to define the beam width and real focal plane of focused sinh-Gaussian beams, thus their focal shift can be determined. 使用环围功率法定义束宽和实际焦面，由此可以决定聚焦双曲正弦高斯光束的焦移。
