TY - JOUR
T1 - Design of random microlens arrays with large scattering angles
AU - Song, Huiying
AU - Huang, Long
AU - Li, Feng
AU - Zhao, Shaoqing
AU - Liu, Yuqing
AU - Liu, Yueting
AU - Zhai, Ruizhan
AU - Dong, Yongjun
AU - Feng, Zexin
AU - Liu, Hua
N1 - Publisher Copyright:
© 2024
PY - 2025/4
Y1 - 2025/4
N2 - Microlens arrays exhibit significant potential for applications in laser beam expansion, shaping, homogenization, and decoherence. Unfortunately, an increase in the target scattering angle of the microlens results in higher surface curvature. This can lead to a significant reduction in transmittance over a specific scattering angle range, directly affecting beam shaping and homogenization processes. In this paper, a design method for randomized microlens array homogenizing optical element with large scattering angles is proposed. A combination of transmission and total internal reflection (TIR) is used to significantly increase the scattering angle of the microlens arrays while maintaining high transmittance. A method of generating microlens arrays using random edge-length ratios is used to eliminate interference and improve the uniformity of the spot. The study explores the uniformity and energy utilization of random microlens arrays during random degree alteration and analyzes the influence of machining errors on homogenization. To validate the novel method, a random microlens array has been developed, featuring a scattering angle range of ± 41°, remarkable uniformity at 82.31 %, and an energy utilization rate of 85.48 %. This research lays a solid foundation for developing random microlens arrays with large scattering angles.
AB - Microlens arrays exhibit significant potential for applications in laser beam expansion, shaping, homogenization, and decoherence. Unfortunately, an increase in the target scattering angle of the microlens results in higher surface curvature. This can lead to a significant reduction in transmittance over a specific scattering angle range, directly affecting beam shaping and homogenization processes. In this paper, a design method for randomized microlens array homogenizing optical element with large scattering angles is proposed. A combination of transmission and total internal reflection (TIR) is used to significantly increase the scattering angle of the microlens arrays while maintaining high transmittance. A method of generating microlens arrays using random edge-length ratios is used to eliminate interference and improve the uniformity of the spot. The study explores the uniformity and energy utilization of random microlens arrays during random degree alteration and analyzes the influence of machining errors on homogenization. To validate the novel method, a random microlens array has been developed, featuring a scattering angle range of ± 41°, remarkable uniformity at 82.31 %, and an energy utilization rate of 85.48 %. This research lays a solid foundation for developing random microlens arrays with large scattering angles.
KW - Beam shaping
KW - Homogenization
KW - Large scattering angle
KW - Random microlens array
UR - http://www.scopus.com/inward/record.url?scp=85210137072&partnerID=8YFLogxK
U2 - 10.1016/j.optlastec.2024.112176
DO - 10.1016/j.optlastec.2024.112176
M3 - Article
AN - SCOPUS:85210137072
SN - 0030-3992
VL - 182
JO - Optics and Laser Technology
JF - Optics and Laser Technology
M1 - 112176
ER -