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从高斯光束的理论出发，研究了Ｔｉ：Ａｌ_２Ｏ_３激光器中各参数间的相互关系，引入了Ｋｅｒｒ非线性透镜效应的影响。根据理论分析的结果，设计可调谐谐振腔，获得了最大可调谐输出能量７７．３ｍＪ，波长可调谐范围６５０～１０３９ｎｍ，光束发散角约为１ｍｒａｄ的ＴＥＭ_００模激光输出。
Based on the theory of Gaussian beam, the relationship between parameters in Ti: Al_2O_3 laser was studied, and the influence of Kerr nonlinear lens effect was introduced. According to the result of theoretical analysis, the tunable resonator is designed and the output of TEM_00 mode laser with maximum tunable output energy of 77.3mJ, wavelength tunable range of 650 ~ 1039nm and beam divergence of 1mrad is obtained.