Phase-coded microlens array for suppressing interference-lattice modulation in highly coherent beam homogenization.

Authors

Yue Zhang, Ruiqi Cheng, Shuhang Qian, Hao Cao, Shuo Chen, Zeyu Yang, Chengqun Gui

Published in

Optics letters. Volume 51. Issue 17. Pages 4884-4887. Sep 01, 2026.

Abstract

Microlens-array (MLA) homogenizers imprint a periodic interference lattice on the flat-top spot when the illumination is highly coherent, degrading uniformity. We propose a phase-coded microlens array (PC-MLA) that superimposes an optimized deterministic piston step on each lenslet, breaking the constructive-interference condition among the beamlets while leaving the aperture, curvature, and focal length unchanged. The step-height matrix is optimized using simulated annealing to suppress the array-factor lattice. Because the phase coding is decoupled from the geometric mapping, the PC-MLA suppresses the interference lattice while largely preserving the beamlet-overlap condition of a dual-MLA homogenizer. The fabricated device attains a uniformity of 92.24% and a modulation depth of 3.95%, outperforming both a periodic MLA and a random MLA while maintaining a sharp square flat-top boundary in a compact, static configuration.

PMID:
42679270
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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