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LED焦散光束的传输特性

Transmission Characteristics of LED Caustic Beam

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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。

Abstract

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.

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中图分类号:O436.1

DOI:10.3788/aos201838.0505004

所属栏目:衍射与光栅

基金项目: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)

收稿日期:2017-12-19

修改稿日期:2017-12-29

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作者单位    点击查看

杨艳飞: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
吴逢铁: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
朱清智: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
胡润: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

联系人作者:吴逢铁(fengtie@hqu.edu.cn)

备注:杨艳飞(1991-),女,硕士研究生,主要从事光束传输与变换方面的研究。E-mail: 568185781@qq.com

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引用该论文

Yang Yanfei,Wu Fengtie,Zhu Qingzhi,Hu Run. Transmission Characteristics of LED Caustic Beam[J]. Acta Optica Sinica, 2018, 38(5): 0505004

杨艳飞,吴逢铁,朱清智,胡润. LED焦散光束的传输特性[J]. 光学学报, 2018, 38(5): 0505004

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