本文分析了SESAM锁模与染料可饱和吸收体锁模的区别，提出了SESAM锁模机理的初步模型。
In this paper, we analyse the difference between SESAM and dye, and present the initial model of the mechanism of SESAM mode-locking.
在理论上分析了利用非线性光学环形镜作为等效可饱和吸收体压缩脉冲进行锁模的物理机制。
The advantages of using NOLM as saturable absorber to compress pulse in mode-locked fiber lasers are analyzed theoretically.
并利用类可饱和吸收体实现被动锁模的自启动条件，给出了用小信号光斑变化量表示的克尔透镜锁模启动条件。
The self-starting condition expressed by the small signal spot size variation is demonstrated, according to the passive absorber-like self-starting condition.
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