modulus of gain的用法和样例：
例句
- The demand of high-power Raman pump light in FRAs is due to the low gain coefficient of the existing optical fibers.
光纤拉曼放大器对于高功率拉曼激发光源的需求原因，来自于现行广为铺设的光纤之中，拉曼增益系数相对为低的理由。 - When the interaction length or gain coefficient is changed, the SBS threshold is changed, and the intensity value of optical limiting is altered.
当改变相互作用长度或者介质增益系数，即可以改变受激布里渊散射的产生阈值，进而改变输出脉冲空间限幅的幅值。
