Abstract
A reflective beam shaper is designed for the purpose of compensation of the low-order aberrations in high-power slab lasers. A proportional-integral-derivative (PID) control algorithm is used to control the optical parameters of a beam shaper for active compensation of low-order aberrations. Simulations of the PID algorithm show that different combinations of defocus, 0-deg astigmatism, and 45-deg astigmatism, which are the main contributors of beam aberrations in slab lasers, can be well compensated by variation of distance and rotation angle of mirrors. For a beam with large wave aberrations (peak-to-valley ðPtV Þ¼ 87.7λ, root-mean-square ðRMS Þ¼ 19λ), the adjustment of distance between mirrors is less than 100 mm, and the rotation angle about the z-axis is <3.2 deg, and the wavefront distortion is reduced to a level (PtV ¼ 0.50λ, RMS ¼ 0.09λ) that can be further corrected with one deformable mirror. The effectiveness and performance of low-order aber- ration compensation with the reflective beam shaper are also verified by experiments. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE) (DOI: 10.1117/1.OE.53.9.096103)
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