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Proceedings Paper

Adaptive conversion of input beam with unsymmetrical intensity distribution to flattop beam based on dual SLMs
Author(s): Haotong Ma; Guowen Zhang; Zongliang Xie; Bo Qi; Ge Ren; Sanhong Wang
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Paper Abstract

We propose and demonstrate the adaptive conversion of input beam with unsymmetrical intensity distribution into a near-diffraction-limited flattop beam with desired parameters in the near field based on a combination of dual phase-only liquid crystal spatial light modulators (LC-SLMs) and the stochastic parallel gradient descent (SPGD) algorithm. One phase-only LC-SLM redistributes the intensity of the input beam to the desired distributions at the other phase-only LCSLM plane, and the other phase-only LC-SLM compensates the wavefront of the output beam. The SPGD algorithm adaptively optimizes the phase distributions of dual phase-only LC-SLMs to reduce the variance between the actual beam shape and the target beam shape. The experimental results on a prefabricated unsymmetrical input beam show that the technique is capable of adaptively creating near-diffraction-limited flattop beams with desired parameters.

Paper Details

Date Published: 21 October 2016
PDF: 6 pages
Proc. SPIE 9989, Technologies for Optical Countermeasures XIII, 99890S (21 October 2016); doi: 10.1117/12.2242023
Show Author Affiliations
Haotong Ma, Institute of Optics and Electronics (China)
Key Lab. of Optical Engineering (China)
National Univ. of Defense Technology (China)
Guowen Zhang, Shanghai Institute of Optics and Fine Mechanics (China)
Zongliang Xie, Institute of Optics and Electronics (China)
Key Lab. of Optical Engineering (China)
Bo Qi, Institute of Optics and Electronics (China)
Key Lab. of Optical Engineering (China)
Ge Ren, Institute of Optics and Electronics (China)
Key Lab. of Optical Engineering (China)
Sanhong Wang, Taiyuan Satellite Launch Ctr. (China)


Published in SPIE Proceedings Vol. 9989:
Technologies for Optical Countermeasures XIII
David H. Titterton; Robert J. Grasso; Mark A. Richardson, Editor(s)

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