Influence of thermal deformation of high-power laser output windows on beam quality

To investigate the influence of thermal deformation of high-power laser output windows on the beam quality,the Strehl ratio formula and the far-field normalized intensity under thermal aberration were induced with the thermal effect of the refractive index of the materials considered.The influence of the thermal aberration of the output windows on the Strehl ratio and the far-field normalized intensity were analyzed and discussed.The results show that under the same laser radiation,in the presence of temperature effect of refractive index,the far-field Strehl ratio of Al2O3 changes the slowest with the laser radiation power among the three materials.