A backlight system using a novel interleaved Fresnel lens array that attains a uniform luminance and two-dimensional directional light control

2021 ◽  
Author(s):  
Garimagai Borjigin ◽  
Hideki Kakeya
Keyword(s):  
Fresnel Lens ◽  
Two Dimensional ◽  
Light Control ◽  
Lens Array

scholarly journals Rapid Fabrication of Continuous Surface Fresnel Microlens Array by Femtosecond Laser Focal Field Engineering

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 112 ◽  
Author(s):  
Linyu Yan ◽  
Dong Yang ◽  
Qihuang Gong ◽  
Yan Li
Keyword(s):  
Femtosecond Laser ◽  
Three Dimensional ◽  
Fresnel Lens ◽  
Two Dimensional ◽  
Direct Writing ◽  
Lens Array ◽  
Two Photon ◽  
Rapid Fabrication ◽  
Continuous Surface ◽  
Two Photon Polymerization

Femtosecond laser direct writing through two-photon polymerization has been widely used in precision fabrication of three-dimensional microstructures but is usually time consuming. In this article, we report the rapid fabrication of continuous surface Fresnel lens array through femtosecond laser three-dimensional focal field engineering. Each Fresnel lens is formed by continuous two-photon polymerization of the two-dimensional slices of the whole structure with one-dimensional scan of the corresponding two-dimensional engineered intensity distribution. Moreover, we anneal the lens array to improve its focusing and imaging performance.

Two-Dimensional Mapping of Localized Characteristics of Concentrator Photovoltaic Module

2012 ◽  
Vol 725 ◽  
pp. 187-190
Author(s):  
Hiroto Yano ◽  
Hirokazu Nagai ◽  
Kazuyuki Tamura ◽  
Kenji Araki ◽  
Kensuke Nishioka
Keyword(s):  
High Efficiency ◽  
Tracking Error ◽  
Fresnel Lens ◽  
Optical Systems ◽  
Photovoltaic Module ◽  
Two Dimensional ◽  
Solar Simulator ◽  
Tracking Errors ◽  
Irradiation Angle ◽  
Dimensional Mapping

For the development of concentrator photovoltaic (CPV) module realizing high efficiency, it is necessary to achieve the high efficiency optical system including Fresnel lens and homogenizer. For the improvement of optical systems, it is very important to understand the contribution of the light irradiated to a localized position on the Fresnel lens. The light beam induced current (LBIC) system was constructed to evaluate the focusing characteristic of the CPV module. We locally irradiated a light from solar simulator to the CPV mini-module and measured the generation current, and the localized characteristics were represented by two-dimensional mappings. Moreover, we evaluated the influence of tracking error by changing the irradiation angle. In the case of tracking errors, the peak of generated current was shifted and the current was decreased. In the case of tracking error of 1.0 o, the total generated current was reduced 12%, in comparison with the normal irradiance.

Beam Homogenization of a Fresnel Lens Array with a Randomly Distributed Phase for Laser Beams

2019 ◽  
Vol 48 (3) ◽  
pp. 314001 ◽  
Author(s):  
裴宪梓 PEI Xian-zi ◽  
梁永浩 LIANG Yong-hao ◽  
王菲 WANG Fei ◽  
朱效立 ZHU Xiao-li ◽  
谢常青 XIE Chang-qing
Keyword(s):  
Fresnel Lens ◽  
Laser Beams ◽  
Lens Array

Multiple optical tweezers generated from phase Fresnel lens array

2012 ◽  
Author(s):  
Jiang Yunfeng ◽  
Xu Jie ◽  
Huang Kaikai ◽  
Lu Xuanhui
Keyword(s):  
Optical Tweezers ◽  
Fresnel Lens ◽  
Lens Array
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