Analysis of transient temperature and thermal stress distribution for heat capacity disk laser

Based on a 3-D transient thermal model with inhomogeneous heat generation,the temperature and thermal stress distribution in the disk of heat capacity laser pumped by high power laser diode array(LDA) are simulated and analyzed by means of finite element methods.The results indicate that for the same pump intensity,the temperature and thermal stress distribution in the disk are not only related with the medium's geometry and the special distribution of pump intensity but also related with the fill factor of pump area.When the fill factor is less than 1,the concentrated tensile stress appeares near edge of disk surface,while the fill factor reaches up to 1,the surface exhibites compressive stress,and the center is less tensile stress.