Author Affiliations
Abstract
1 State Key Laboratory of Luminescent Materials and Devices, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
2 Department of Orthopedics, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China
3 School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu 273165, China
Bismuth (Bi)-doped photonic materials, which exhibit broadband near-infrared (NIR) luminescence (1000–1600 nm), are evolving into interesting gain media. However, the traditional methods have shown their limitations in enhancing Bi NIR emission, especially in the microregion. Consequently, the typical NIR emission has seldom been achieved in Bi-doped waveguides, which highly restricts the application of Bi-activated materials. Here, superbroadband Bi NIR emission is induced in situ instantly in the grating region by a femtosecond (fs) laser inside borosilicate glasses. A series of structural and spectroscopic characterizations are summoned to probe the generation mechanism. And we show how this novel NIR emission in the grating region can be enhanced significantly and erased reversibly. Furthermore, we successfully demonstrate Bi-activated optical waveguides. These results present new insights into Bi-doped materials and push the development of broadband waveguide amplification.
Photonics Research
2019, 7(3): 03000300
1 浙江省医疗器械检验研究院, 浙江 杭州 310018
2 中国人民解放军第三军医大学, 重庆 400037
针对胶囊式内窥镜, 建立了全视场光学分辨率与像素数匹配水平的评价, 以及像素数分辨有效性的评价方法。该方法通过选择过面阵传感器行或列扫描水平的光轴截面为分析用子午面, 以光学分辨角和像素元投射角为分析单元导出线分辨元数、线像素数有效率、视场中心匹配率及全视场最大匹配率, 并采用球面视场的分辨距与分辨角简易转换来简化测量方法。这些参数构成了胶囊式内窥镜像素数的匹配率和分辨有效性的评价依据, 可为产品设计分析、评价及修改提供参考依据。
胶囊式内窥镜 匹配率 分辨有效性 像素数 capsule endoscope matching rate resolution effectiveness pixel
1 宁波大学 高等技术研究院 红外材料及器件实验室, 浙江 宁波 315211
2 华南理工大学 发光材料与器件国家重点实验室, 广东 广州 510641
3 云南北方驰宏光电有限公司, 云南 昆明 650000
大口径硫系玻璃在**及民用高分辨率红外夜视成像领域有着重要的应用价值。现阶段缺少针对大口径硫系玻璃内部缺陷(包括条纹、杂质和裂纹等)进行量化评价的检测技术, 因此硫系玻璃的品质控制成为了限制其大范围发展的瓶颈之一。针对课题组大口径硫系玻璃的透射光谱特性以及现有的近红外照相机的光谱响应特性, 提出了一种工作在近红外波段的大口径硫系玻璃内部缺陷检测技术并设计成像镜头, 镜头包含了使用K9、F6玻璃的三片双胶合透镜, 有效焦距为200 mm, 在近红外波段0.95~1.05 μm实现消色差, 成像质量接近衍射极限。根据镜头特点搭建了大口径硫系玻璃内部缺陷测试装置, 实验验证了镜头的分辨率与设计要求相符, 并可针对大口径硫系玻璃的各种内部缺陷进行有效检测。
大口径硫系玻璃 光学设计 内部缺陷 近红外成像 large diameter chalcogenide glass optical design internal artifacts near infrared imaging 红外与激光工程
2016, 45(7): 0718002
1 华南理工大学光通信材料研究所， 发光材料与器件国家重点实验室， 广东 广州 510640
2 广州锐得森特种陶瓷科技有限公司， 广东 广州 510460
3 广东出入境检验检疫局， 广东 广州 510623
由纳米多孔玻璃制备了Al3+/Eu2+共掺杂的高硅氧玻璃，并研究了在纳米多孔玻璃基质中共掺杂Al3+离子对Eu2+离子450 nm处蓝色荧光强度和荧光峰位的影响。结果表明，共掺杂Al3+离子可分散多孔玻璃中丛聚的Eu2+离子，加之Al2O3较低的声子能量，使Eu2+离子的蓝色荧光发射显著增强；并且由于共掺杂的Al3+降低了Eu2+离子5d轨道劈裂幅度，随着Al3+离子含量的增加，Eu2+离子荧光峰蓝移。
材料 Eu2+离子 Al3+离子 高硅氧玻璃 荧光性质 中国激光
2012, 39(11): 1106002
Author Affiliations
Abstract
A simple and efficient method for the synthesis of water-soluble NdF3 and NdF3:Ba2+ nanocrystals under hydrothermal conditions is established. The method involves the coating of the nanocrystals with a layer of hydrophilic polymer polyvinylpyrrolidone (PVP). The as-prepared products are characterized by powder X-ray diffraction, field emission scanning electronic microscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The PVP coating transforms the nanocrystals into a biocompatible material and improves the fluorescence intensity of NdF3 in the near infrared (NIR) region. The morphology of the nanoparticles changes, whereas the fluorescence intensity of NdF3 in the NIR region increases when a small amount of Ba2+ is doped into the NdF3/PVP nanoparticles.
160.0160 Materials 160.2540 Fluorescent and luminescent materials 160.4236 Nanomaterials 160.4670 Optical materials Chinese Optics Letters
2012, 10(2): 021602
1 宁波大学光电子功能材料重点实验室, 浙江 宁波 315211
2 华南理工大学光通信材料研究所特种功能材料教育部重点实验室, 广东 广州 510640
用高温熔融法制备了不同Tm3+摩尔分数掺杂的摩尔分数比为0.3(SiO2)0.1(Al2O3)0.1(AlF3)0.5(PbF2)x(Tm2O3)(摩尔分数x=0.5%,1.0%,2.0%,3.0%)玻璃。从吸收光谱特性出发,应用Judd-Ofelt理论,计算得到了Tm3+的J-O强度参量(Ω2,Ω4,Ω6)及Tm3+各激发能级的自发辐射跃迁概率、荧光分支比以及辐射寿命等光谱参量。在808 nm波长的激光二极管激发下,研究了不同Tm3+掺杂摩尔分数下玻璃在约1.47 μm与约1.8 μm处的荧光特性,在掺杂摩尔分数约达到2.0%时,在1.8 μm处的荧光强度达最大,然后随着掺杂摩尔分数的增大,其荧光强度反而降低。作者从Tm3+的交叉弛豫与摩尔分数猝灭效应解释了这一荧光强度变化的规律,同时,根据McCumber理论计算了Tm3+跃迁3H6→3F4的吸收截面和跃迁3F4→3H6的受激发射截面。
光学材料 掺铥氟氧化物玻璃 光谱性质 交叉弛豫效应
