A theoretical study of input and output properties of four - level solid laser was performed according to the velocity equation , and the important role of the overlap integral j , was noticed and made a fully usage in optimizing the end - pumping solid state laser parameters such as : rod length > pump position pumping and oscillating beam waist size 從四能級速率方程出發(fā),理論推導(dǎo)了ld端面泵浦的固體激光器的輸入輸出特性,并指出重疊積分j _ 1對激光器輸出特性的極大影響,從而對其在不同泵浦條件下進行分析并以此得到端面泵浦條件下固體激光器的最優(yōu)化設(shè)計參數(shù)的選取方法。