Modelocking can be induced not only by loss modulation, but also by phase modulation.
锁模不仅可用损耗调制取得，也可用位相调制来得到。
2
The starting characteristics are theoretically analyzed according to the self-starting condition of Kerr lens modelocking.
利用克尔透镜锁模自启动条件，对常用的四镜腔激光器的启动特性进行了系统分析。
3
The effects of phase bias and group velocity dispersion on modelocking mechanism are analyzed. The operating conditions for stable short pulse generation are obtained.