Design of two-dimensional diffractive optical elements for beam shaping of white light

Yunpeng Wu; Wenhui Cao; He Jiang; Bing Cao; Chinhua Wang

doi:10.1117/12.3039158

13 September 2024 Design of two-dimensional diffractive optical elements for beam shaping of white light

Yunpeng Wu, Wenhui Cao, He Jiang, Bing Cao, Chinhua Wang

Proceedings Volume 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024); 1325405 (2024) https://doi.org/10.1117/12.3039158
Event: Fourth International Conference on Optics and Image Processing (ICOIP 2024), 2024, Chongqing, China

Abstract

Laser diodes (LDs) can not only be used for solid-state illumination, but also have broad applications in visible light communication (VLC) due to large modulation bandwidth. In order to realize the bifunctional applications of both laser illumination and visible light communication, the red-green-blue (RGB) LDs of synthetic white light should have the same shape and uniform intensity in the illumination region. Here, we propose and demonstrate the beam shaping and uniformity function at red-green-blue wavelengths of 450 nm, 532 nm, and 625 nm by a single two-dimensional diffractive optical element (DOE). By using the iterative algorithm in conjunction with the optimization algorithm and variable weight, the proposed device can achieve an average energy efficiency of 81.27% and an average light spot uniformity of 91.64% under RGB trichromatic lighting conditions. Experimental fabrication of the proposed DOE was fabricated using UV laser direct writing photolithography, and the experimental results show that an average energy efficiency of 60.25% and an average uniformity of 83.76% of a rectangular spot at three wavelengths of RGB can be obtained, and excellent beam shaping and homogenization under composite white light illumination can also be achieved by the fabricated two-dimensional DOE.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yunpeng Wu, Wenhui Cao, He Jiang, Bing Cao, and Chinhua Wang "Design of two-dimensional diffractive optical elements for beam shaping of white light", Proc. SPIE 13254, Fourth International Conference on Optics and Image Processing (ICOIP 2024), 1325405 (13 September 2024); https://doi.org/10.1117/12.3039158

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KEYWORDS

Diffractive optical elements

Beam shaping

Design

RGB color model

Energy efficiency

Light sources and illumination

Fabrication

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