Active compensation of low-order aberrations with reflective beam shaper

Wenguang Liu; Qiong Zhou; Fei Feng; Zongfu Jiang

doi:10.1117/1.OE.53.9.096103

5 September 2014 Active compensation of low-order aberrations with reflective beam shaper

Wenguang Liu, Qiong Zhou, Fei Feng, Zongfu Jiang

Author Affiliations +

Optical Engineering, Vol. 53, Issue 9, 096103 (September 2014). https://doi.org/10.1117/1.OE.53.9.096103

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 (PtV)=87.7λ , root-mean-square (RMS)=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=0.50λ , RMS=0.09λ ) that can be further corrected with one deformable mirror. The effectiveness and performance of low-order aberration compensation with the reflective beam shaper are also verified by experiments.

Citation Download Citation

Wenguang Liu, Qiong Zhou, Fei Feng, and Zongfu Jiang "Active compensation of low-order aberrations with reflective beam shaper," Optical Engineering 53(9), 096103 (5 September 2014). https://doi.org/10.1117/1.OE.53.9.096103

Published: 5 September 2014

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