The causes and suppression methods of parasitic lasing in transverse direction of Fe²⁺:ZnSe laser are analyzed theoretically and experimentally. For a crystal with given diameter, there exists a maximum pump spot diameter d_max, below which the parasitic lasing doesn’t occur. The effective maximum pump spot diameter d_max can be increased by coating graphite on the side of the laser crystal, and the average increase of d_max is about 1.7 times after coating. The thermoelastic stresses and deformations on the Fe²⁺:ZnSe crystal under pulsed pumping mode are modeled, with results showing that it is possible by choosing doping profile shape to significantly reduce optical distortions and increase pulse power.

从理论和实验上分析了Fe ²⁺：ZnSe激光器横向产生寄生激光的原因和抑制方法。对于具有给定直径的晶体，存在最大泵浦点直径d _max，在该最大泵浦点直径d _max以下，不会发生寄生激光。可以通过在激光晶体侧面涂覆石墨来增加有效最大泵浦光斑直径d _max，涂覆后d _max的平均增加_值约为1.7倍。Fe ²⁺的热弹性应力和变形对ZnSe晶体在脉冲泵浦模式下进行了建模，结果表明，通过选择掺杂轮廓形状可以显着减少光学畸变并增加脉冲功率。