Mirror Deformations and Wavefront Aberrations Caused by C.w. High Power Laser Beams

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Abstract
The thermal deformation of a metallic mirror used for focusing on or simply directing a laser beam to a workpiece is investigated. The displacement of the front surface is evaluated by using a rapidly converging Dini series. The effects of the distortion on the peak intensity of a focal spot are evaluated by using the normalized intensity function i(P) as a performance figure. Expanding the distorted mirror aberration function in a series of Zernike polynomials, the dependence of i(P) on the mirror illumination and physical parameters is assessed. The results of many calculations illustrate the potential of this analysis.

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