To achieve uniform laser output,a uniformity study of the absorbed light field,the gain distribution,and the output beam uniformity is conducted in this paper.Based on the absorption characteristics of Nd∶[KG-*2/3]YAG,the absorption coefficient is modified by varying the doping concentration and temperature of the crystal rod.In terms of simulation,ZEMAX software is employed to model the absorbed light field in an LD side pumped Nd∶[KG-*2/3]YAG crystal rod.The intensity distribution of the absorption light field under different absorption coefficients is simulated,and the influence of this coefficient on the absorption light field distribution is comparatively analyzed.In terms of experiment,the gain distribution of crystal rods under different absorption coefficients is measured to validate the simulation results,and the uniformity of the output laser beam is also studied.The relationship between the absorption coefficient and the uniformity of the absorption light field,the gain distribution,and the output laser beam is obtained.It is found that as the absorption coefficient increases,the central intensity gradually decreases,providing a reference for achieving high uniformity,high energy laser output.