Adaptive conversion of a wavefront-distortion beam to near-diffraction-limited flattop beam based on stochastic parallel gradient descent algorithm

Haotong Ma; Zhan Yu; Xiaolin Wang; Yanxing Ma; Pu Zhou; Xiaojun Xu; Zejin Liu

doi:10.1117/12.870653

16 November 2010 Adaptive conversion of a wavefront-distortion beam to near-diffraction-limited flattop beam based on stochastic parallel gradient descent algorithm

Haotong Ma, Zhan Yu, Xiaolin Wang, Yanxing Ma, Pu Zhou, Xiaojun Xu, Zejin Liu

Author Affiliations +

Proceedings Volume 7843, High-Power Lasers and Applications V; 78430P (2010) https://doi.org/10.1117/12.870653
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

In this paper, a system of containing dual deformable mirrors (DMs) is proposed to adaptively conversion of input beam with wave front distortion into near-diffraction-limited flattop beam based on the stochastic parallel gradient descent (SPGD) algorithm. In the analysis, the wave front distortion of the input beam is chosen as the Zernike representation of Kolmogoroff spectrum of turbulence. The whole shaping system is controlled by the SPGD algorithm. One DM adaptively redistributes the intensity of the input beam and the other adaptively compensates the wave front of the output beam. The near-diffraction-limited flattop beams with different parameters are realized by this technique. The near-diffraction-limited square flattop beam retains an flattop intensity distribution without significant diffraction peaks for a working distance of more than 60cm in the near field.

Citation Download Citation

Haotong Ma, Zhan Yu, Xiaolin Wang, Yanxing Ma, Pu Zhou, Xiaojun Xu, and Zejin Liu "Adaptive conversion of a wavefront-distortion beam to near-diffraction-limited flattop beam based on stochastic parallel gradient descent algorithm", Proc. SPIE 7843, High-Power Lasers and Applications V, 78430P (16 November 2010); https://doi.org/10.1117/12.870653

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