Abstract

This paper presents the characteristics of wavefront and far-field optical pattern from high power laser mirror which suffered from thermal deformations. Zernike polynomials are introduced to describe aberrations of laser-induced thermal deformations. And, the far-field optical patterns of radiation are calculated by using Fourier transformation and measured by interference experiments. The result indicates that main aberrations are defocusing and primary coma, and that the tilt cannot be ignored. Some optical patterns and contour maps which depend on the laser beam power applied to the mirror and the exposure time are given. Finally a new clamping method is suggested, which can reduce the tilt of mirror and increase the pointing stability of high power laser beam.

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