Adaptive conversion of input beam with unsymmetrical intensity distribution to flattop beam based on dual SLMs

Haotong Ma; Guowen Zhang; Zongliang Xie; Bo Qi; Ge Ren; Sanhong Wang

doi:10.1117/12.2242023

21 October 2016 Adaptive conversion of input beam with unsymmetrical intensity distribution to flattop beam based on dual SLMs

Haotong Ma, Guowen Zhang, Zongliang Xie, Bo Qi, Ge Ren, Sanhong Wang

Author Affiliations +

Proceedings Volume 9989, Technologies for Optical Countermeasures XIII; 99890S (2016) https://doi.org/10.1117/12.2242023
Event: SPIE Security + Defence, 2016, Edinburgh, United Kingdom

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

Citation Download Citation

Haotong Ma, Guowen Zhang, Zongliang Xie, Bo Qi, Ge Ren, and 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); https://doi.org/10.1117/12.2242023

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