用速率方程方法模拟计算了瞬态同步泵浦激光脉冲的发展过程,着重分析了十二次调制所特有的瞬态特性,计算了泵浦强度对光脉冲的影响.计算结果,激光脉冲经历一个先变窄后展宽,再趋于动态平衡的过程;增益调制仅在前几次泵浦下有调制作用;泵浦越强,激光脉冲越宽.用1.25(ps/channel)的条纹相机进行精确实时测量,得到了定性一致的实验结果.

The evolution of light pulses from a synchronously pumped transient mode-looked rhodamine dye laser has been caloulated by using the rate equation method. The transient characteristics of the system with only 12-round-trip modulation are analysed. The real time observed on a streak camera with 1.25 (ps/ channel) is in a qualitative agreement with the computed results. Effects of the pump power on the laser pulse width are calculated. We found that the laser pulses first become shorter, then become longer and finally tend to a dynamio equilibrim. The gain. modtuation plays a role only in "the former part of laser poise round-trips； the laser pulse "width becomes longer as the pump increases.