cascade phenomenon meaning in English

级联现象
连锁现象

For the first time , high frequency conversion efficiency is achieved at home , and output wavelength range is form visible to infrared . 5 . introducing the present situation of qpm - opo laser , from the three waves coupling equation , we analyze the theory of ppln - opo , and explain the cascade phenomena successfully
5 、介绍了qpm 0p0激光器发展现状，从三波耦合方程出发，分析了ppl po的变频特性，并对ppln po的实验中的串级效应进行了定性的分析。