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Proceedings Paper

Adaptive conversion of a wavefront-distortion beam to near-diffraction-limited flattop beam based on stochastic parallel gradient descent algorithm
Author(s): Haotong Ma; Zhan Yu; Xiaolin Wang; Yanxing Ma; Pu Zhou; Xiaojun Xu; Zejin Liu
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Paper 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.

Paper Details

Date Published: 17 November 2010
PDF: 7 pages
Proc. SPIE 7843, High-Power Lasers and Applications V, 78430P (17 November 2010); doi: 10.1117/12.870653
Show Author Affiliations
Haotong Ma, National Univ. of Defense Technology (China)
Zhan Yu, National Univ. of Defense Technology (China)
Xiaolin Wang, National Univ. of Defense Technology (China)
Yanxing Ma, National Univ. of Defense Technology (China)
Pu Zhou, National Univ. of Defense Technology (China)
Xiaojun Xu, National Univ. of Defense Technology (China)
Zejin Liu, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 7843:
High-Power Lasers and Applications V
Upendra N. Singh; Dianyuan Fan; Jianquan Yao; Robert F. Walter, Editor(s)

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