固体激光器弛豫振荡尖峰脉冲参数的影响因素分析

利用固体激光器的弛豫振荡的尖峰脉冲特性,设计制作了一个窄脉宽、高重复频率的脉冲激光器。其方法是通过调节脉冲电流源的电流脉冲宽度,在固体激光器刚发出第一个尖峰脉冲时即关断泵浦电流。在实验中,对影响其尖峰脉冲参数的因素进行了探索,得出了尖峰脉冲的峰值功率、脉冲宽度与泵浦电流、腔长、输出镜透过率的关系,并从原理上对其进行了定性的分析和解释。基于实验及分析得到的结果,通过调整激光器的参数,设计出的脉冲激光器峰值功率能达到8W,脉宽能达到10 ns,重复频率可以达到百kHz的量级。文中的实验和分析结果对于固体激光器弛豫振荡的尖峰脉冲特性的理论认识及利用固体激光器弛豫振荡特性来设计脉冲激光器的参数设计都具有一定的指导意义。

Analysis of influencing factors on relaxation oscillations spike parameters of solid-state lasers

A pulsed laser with short pulse width and high repetition frequency was designed based on the spiking characteristics of relaxation oscillations of solid-state laser.The design was achieved by adjusting the pulse width of the pulsed electric source and turning down the current immediately after the solid-state lasers emitting the first spike of relaxation oscillations.The factors that influence the first spike parameters were researched by experiments.The relationships among peak power,pulse width of first spike and pumped circuit,cavity length,reflectivity of output mirror were deduced,and their interrelations were qualitatively analyzed and explained.At last,a pulsed laser with peak power of 8 W,pulse width of 10 ns,and repetition frequency of hundreds of kHz was designed based on the above experimental and analytical results.These results have directive meanings not only for theoretical research of spiking characteristics of relaxation oscillations,but also for the design of pulsed lasers by making use of spiking characteristics of relaxation oscillations.