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在理论上提出了Ｃｒ４＋ＹＡＧ作为可饱和吸收体在ＮｄＹＡＧ激光器中实现被动锁模的可能性，运用速率方程组导出在强激光脉冲作用下Ｃｒ４＋ＹＡＧ激发态吸收的恢复时间和饱和光强。实验上在带有抗共振环结构的接近于介稳腔的脉冲式ＮｄＹＡＧ激光器中用Ｃｒ４＋ＹＡＧ作为可饱和吸收体实现被动锁模运转，得到能量１３．５ｍＪ、平均脉宽１８０ｐｓ的锁模脉冲序列。
The possibility of using Cr4 + YAG as a saturable absorber in passive mode-locking in NdYAG laser is proposed in theory. The recovery time and saturation intensity of Cr4 + YAG excited state absorption under strong laser pulse are derived using the rate equation. Experimentally, a mode-locked pulse sequence with energy 13.5 mJ and average pulse width 180 ps was obtained by using a Cr4 + YAG as a saturable absorber in a pulsed NdYAG laser with an antiresonant ring structure close to the metastable cavity.