低能量抽运的增益开关型Cr^(4+)∶Mg_2SiO_4激光器

Gain-switched Cr^(4+)∶Mg_2SiO_4 laser with low pump energy

为了研究低能量的1.06μm调Q激光脉冲抽运的增益开关型Cr4+∶Mg2S iO4激光器,对该激光器的速率方程进行数值求解,并选取合适的初始条件,得到输出的1.22μm激光脉冲的时间波形、脉冲的建立时间和脉冲宽度与抽运能量的关系,理论计算与实验研究结果基本符合。当抽运激光脉冲的能量为45m J、脉冲宽度为30ns时,激光器输出的1.22μm激光脉冲的能量和脉宽分别是7m J和8.2ns。输出激光的脉冲宽度是抽运激光的脉冲宽度的近1/4,光-光转换效率为15.5%。数值计算和实验研究结果均表明,在低能量抽运情况下,激光脉冲的建立时间和脉冲宽度均随着抽运能量的增加而减小。

A gain-switched Cr^4＋ ： Mg2SiO4 laser pumped by a 1. 06μm Q-switched laser pulse with lower energy is investigated. By numerically solving the rate equations and choosing the suitable initial conditions, the temporal profile of the 1.22μm laser pulse is obtained. Simultaneously the relations of the buildup time and the pulse-duration of the 1. 22μm laser with the pump energy are achieved respectively and the theoretical and experimental results basically coincide with each other. When the energy and the pulse-duration of the pump laser pulse are 45mJ and 30ns respectively,a 1. 22μm laser pulse is achieved with the energy of 7mJ and the pulse-duration of 8.2ns. The pulse-duration of the output laser is nearly a quarter of that of the pump laser and the transfer efficiency is 15.5%. The numerical calculation and the experimental results show that both the buildup time and pulse-duration decreased as the pump energy increasing.