利用激光打标法制备侧面均匀发光聚合物光纤  

Uniform Side-Glowing Polymer Optical Fiber Fabricated by Laser-Marking

作　　者：漆宇 刘楚嘉 何涌 郜飞飞 李梓润 庄其仁 Qi Yu;Liu Chujia;He Yong;Gao Feifei;Li Zirun;Zhuang Qiren(College of Information Science and Engineering,Fujian Provincial Key Laboratory of Light Propagation and Transformation,Huaqiao University,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12期44-53,共10页Acta Optica Sinica

基　　金：国家自然科学基金(61178015);福建省科技计划(高校产学合作)重大项目(2016H6016);华侨大学研究生科研创新能力培育项目(1611301008).

摘　　要：研究了一种侧面均匀发光聚合物光纤(POF)的制备方法,采用激光打标技术在POF侧面制作变栅距(VLS)光栅型散射点,建立了激光打标VLS散射点模型,该模型由深度很浅的表面凹坑和纤芯内分布着散射颗粒的散射区组成。理论推导出散射点相对散射光功率和VLS栅距的计算公式,分析了散射点的散射光功率随凹坑深度和颗粒密度的变化规律,以及不同散射点凹坑深度和不同POF侧面发光相对出射度下VLS栅距的分布规律。结果表明散射点凹坑深度的微小变化(微米量级)对散射点的散射光功率和VLS栅距的影响很大。当散射颗粒密度N<105 mm-3时,散射点散射光功率变化不大;但是当N>105 mm-3时,散射光功率变化明显。理论计算了不同散射点凹坑深度和不同相对出射度的VLS栅距分布曲线,并且通过实验验证了理论结果的正确性。通过调节激光打标功率,实验得到了亮度均匀度高于90%的侧面发光POF。A new method for the fabrication of a uniform side-glowing polymer optical fiber (POF) is investigated. The varied-line-space (VLS) grating scattering points are fabricated on the side of POF by laser-marking. The model of VLS grating scattering points by laser-marking is established, which is composed of shallow surface pits and scattering areas where scattering particles are distributed. The relative scattering power of scattering points and the calculating formula of VLS are derived theoretically. The change law of scattering light power of scattering points versus pit depth and particle density is analyzed. The distribution rule of VLS grating pitch versus pit depth and relative emissivity of side-glowing POF is also discussed. The results show that the tiny variation (μm level) of pit depth of scattering points has a great influence on scattering light power and VLS grating pitch. When scattering particle density is N<105 mm-3, the variance of scattering light power with the scattering point density is small. In contrast, if the scattering particle density is N >105 mm-3, the variance becomes obvious. The distribution curves of VLS grating pitch under different pit depths and relative emissivities are calculated theoretically, which are verified by experiments. In experiments, a side-glowing POF with a brightness uniformity of larger than 90% is obtained just by the adjustment of laser-marking power.

关 键 词：光纤光学 聚合物光纤 侧面发光 激光打标技术 变栅距光栅 散射点 

分 类 号：O439[机械工程—光学工程]