Transient thermal effect of high power laser mirrors and its propagating characters of far-field

The analytical solutions of the two-dimensional transient thermal effect of high power laser mirrors are developed by using integrate transform technique. Zernike polynomials are introduced to describe aberrations of laser-induced thermal deformations. And, the corresponding expressions of the Strehl ratio and the intensity distribution are gained. Some far-field optical patterns from which we can directly see the divergence of intensity are given. The predicted results are in agreement with that of experiment.