增益开关型四能级激光器的时间特性分析

Analysis of the Temporal Performance of a Gain-switched Four-level Laser

从四能级系统的速率方程出发 ,结合实际的物理条件 ,针对极短脉冲 (10 ns)泵浦下增益开关型激光器的时间特性建立了一个简洁模型 ,得到了输出脉冲的建立时间和脉冲宽度与泵浦能量及能量密度之间的解析关系式 ,并结合实验分析了模型的合理性。

This article reports a simple theoretical model developed for the temporal performance of a short laser pulse pumped, gain-switched, four-level laser system. The model is based on the rate-eqations of four-level systems and some practical physics conditions. From the model, we obtain some analytical relationships between the build-up time, pulse width of the output laser pulse and the pumping energy and energy density. The rationality of the model is analyzed according to the expermental results.