Cr4+:YAG晶体作为可饱和吸收体用于主-被动锁模的Nd:YAG激光器中,获得了稳定和完全的1064 nm锁摸脉冲列。更换具有不同初始透过率的Cr4+:YAG晶体,获得了从0.8 ns到2.4 ns宽的单个锁模脉冲。对于使用不同初始透过率的Cr4+:YAG晶体, 存在一个合适的初始透过率,使得脉冲宽度最短.考虑激发态的吸收, 利用速率方程分析了锁模的动力学过程,解释了实验结果。

Cr4+:YAG crystal was used as a saturable absorber in an active-passive mode-locked Nd:YAG laser. The stable and complete mode-locked pulse train was achieved at 1064 nm. The duration of a single pulse from ～0.8 ns to 2.4 ns was obtained by using Cr4+:YAG crystals with the different initial transmissions, and there was a shortest pulse width. The mode-locking dynamic process of Cr4+: YAG crystal was discussed to explain the experimental result, and the effect of excited-state absorption was considered.