21 October 2016 Adaptive conversion of input beam with unsymmetrical intensity distribution to flattop beam based on dual SLMs
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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.
Conference Presentation
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Haotong Ma, Haotong Ma, Guowen Zhang, Guowen Zhang, Zongliang Xie, Zongliang Xie, Bo Qi, Bo Qi, Ge Ren, Ge Ren, Sanhong Wang, Sanhong Wang, } "Adaptive conversion of input beam with unsymmetrical intensity distribution to flattop beam based on dual SLMs", Proc. SPIE 9989, Technologies for Optical Countermeasures XIII, 99890S (21 October 2016); doi: 10.1117/12.2242023; https://doi.org/10.1117/12.2242023
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