LED焦散光束的传输特性  

Transmission Characteristics of LED Caustic Beam

作　　者：杨艳飞 吴逢铁 朱清智 胡润 Yang Yanfei;Wu Fengtie;Zhu Qingzhi;Hu Run(College of Information Science and Engineering, Huaqiao University, Fujian Key Laboratory of Optical Beam Transmission and Transformation, Xiamen, Fujian 361021, China)

机构地区：[1]华侨大学信息科学与工程学院福建省光传输与变换重点实验室,福建厦门361021

出　　处：《光学学报》2018年第5期51-58,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61178015);国家自然科学基金青年科学基金(61605049);福建省科技重大项目(2016H6016)

摘　　要：利用LED光源产生焦散光束,并应用交叉谱密度函数及多光谱叠加的原理计算了轴棱锥后LED部分相干焦散光束的光强分布。理论分析和实验结果验证了像散等参量对焦散光束的影响。通过研究传输距离对LED焦散光束的影响发现,随着传输距离增大,焦散光束星状外轮廓尺寸变大,中心光斑逐渐向外环对称分裂,同时中心光强相应减弱,光点阵列衬比度逐渐降低,最终将演化成近似空心光束。研究结果丰富了焦散光束的内涵,为LED焦散光束的实际应用提供了理论基础和实验依据。The LED caustic beam is generated by LED light source.A method of using cross-spectral density function and superposition of multi-spectral is proposed to calculate the intensity distribution of the LED caustic beam through the axicon.The influence of parameters such as dispersion on caustic beam is theoretically and experimentally demonstrated.The influence of the transmission distance on the LED caustic beam is further studied.It is found that the outer contour of the caustic beam becomes larger and the central light spots symmetrically split into light spot array as the transmission distance increases. Meanwhile,the central intensity decreases correspondingly,and the contrast of the light spot array decreases gradually.It will evolve into an approximately hollow beam eventually.This research results enrich the connotation of caustic beam,and provide a theoretical basis and experimental evidence for the practical application of LED caustic beam.

关 键 词：衍射 LED焦散光束 部分相干光 交叉谱密度 轴棱锥 

分 类 号：O436.1[机械工程—光学工程]