Author Affiliations
Abstract
1 School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
2 Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
3 Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Laboratory of Modern Optical Technologies of Ministry of Education, Suzhou 215006, China
FM-to-AM conversion for angular filtering based on transmitted volume Bragg gratings (TBGs) is discussed. Simulation results show that a narrower spectral selectivity of TBGs led to stronger FM-to-AM conversion. Good angular selectivity and a wide bandwidth for the TBGs can be obtained by controlling the grating period and thickness. FM-to-AM conversion can be effectively suppressed and the distortion criterion for the filtered beam reduces to less than 5%. FM-to-AM conversion of TBGs is demonstrated in the ‘Shenguang’ facility, and the results are in good agreement with the simulation.
FM-to-AM conversion spectral selectivity volume Bragg grating High Power Laser Science and Engineering
2019, 7(2): 02000e34
南京航空航天大学材料科学与技术学院, 江苏 南京 210016
选择不同光谱选择性材料制备涂层, 比较其可见光 -近红外光谱反射性能差异, 并通过测试模拟罐体内介质温度和涂层辐射性能及耐环境性能, 探究光谱选择性散热涂层的材料性能差异及选择依据。采用 UV-Vis-NIR分光光度计对涂层在紫外-可见-近红外波段的反射性能进行表征, 采用 SEM测试对涂层结构进行表征及分析, 并使用红外发射率仪测试涂层发射率性能。结果表明: 金红石型 TiO2作为填料的涂层, 太阳光反射率可达 77.65%, 在 8～14.m波段发射率为 0.96, 且 60 ℃ RH96%耐湿热测试时长 720 h以上以及紫外老化时长 360 h以上仍保持良好的性能和外观。
光谱选择性 散热涂层 发射率 片状铝粉 spectral selectivity cooling coating emission ratio TiO2 TiO2 flake Al
北京理工大学 光电学院 光电成像技术与系统教育部重点实验室, 北京 100081
提出了一种新型光学接收天线的设计和制作方法, 利用干涉和衍射原理在全息材料上制成具有聚集光束和滤除环境光双重功能的全息反射镜.通过耦合波理论与k矢量闭合法分析了这种光学接收天线的角度选择性、光谱选择性以及任意点的衍射效率, 模拟结果表明: 全息反射镜在不同点的视场角和光谱带宽分别为0.8°-13.4°和4.4 nm-7.4 nm, 并且整体衍射效率在95.3%以上.与由聚光镜和滤波片组合成的传统光学接收天线相比, 全息反射镜体积小、重量轻、成本低、能作为光学接收天线用于室内可见光通信系统中.
室内可见光通信 光学接收天线 全息反射镜 耦合波理论 角度选择性 光谱选择性 衍射效率 Indoor visible light communication Optical receiving antenna Holographic mirror Coupled wave theory Angular selectivity Spectral selectivity Diffraction efficiency
