Adaptive-weight iterative algorithm for flat-top laser beam shaping

Dong Wang; Jian Zhang; Hongxin Zhang

doi:10.1117/1.OE.51.7.074301

18 July 2012 Adaptive-weight iterative algorithm for flat-top laser beam shaping

Dong Wang, Jian Zhang, Hongxin Zhang

Author Affiliations +

Optical Engineering, Vol. 51, Issue 7, 074301 (July 2012). https://doi.org/10.1117/1.OE.51.7.074301

Abstract

An adaptive-weight fast-Fourier-transform-based iterative algorithm is proposed for far-field flat-top beam shaping. This algorithm inherits the projection optimization idea from the Gerchberg-Saxton algorithm, but the far-field amplitude for inverse fast Fourier transform is adaptively modified by using a novel optimized adaptive-weight strategy. First, the application of this method to square flat-top intensity-profile beam shaping is discussed as an example. The pure-phase distribution simulated by 100 iterations of this method concentrates 93.89% of the incident laser energy into the desired region and the root mean square error (RMSE) of the tailored flat-top intensity profile is 0.0094. Less than 20 iterations of this method concentrate more than 90% of the incident laser energy into the desired region and the RMSE of the tailored flat-top intensity profile is under 0.05. Then, the applicability of the method to designing the phase distributions for variable-shape or variable-diameter flat-top beam shaping is demonstrated.

Citation Download Citation

Dong Wang, Jian Zhang, and Hongxin Zhang "Adaptive-weight iterative algorithm for flat-top laser beam shaping," Optical Engineering 51(7), 074301 (18 July 2012). https://doi.org/10.1117/1.OE.51.7.074301

Published: 18 July 2012

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