周新圆 1,2,*江豹 3,4王云杰 1,2赵璨 1,2苏欣 1,2
作者单位
摘要
1 伊犁师范大学物理科学与技术学院,伊宁 835000
2 伊犁师范大学新疆凝聚态相变与微结构实验室,伊宁 835000
3 新疆大学化工学院, 乌鲁木齐 830017
4 石油天然气精细化工教育部暨自治区重点实验室,乌鲁木齐 830017
晶体材料的微观结构对于宏观性能有着决定性的作用, 探究材料电子结构与光学性质之间的关系是合成新型材料研究的基础方向之一。本文基于密度泛函理论的第一性原理, 系统地对X(PO3)2(X=Zn, Cd, Hg), 这三例阳离子含d10电子构型元素的三元磷酸盐晶体的电子结构与光学性质进行了研究。Zn(PO3)2、Cd(PO3)2和Hg(PO3)2三种材料的带隙宽度依次减小, 分别为5.089、4.065和 2.942 eV。通过分析禁带附近的能带轨道归属, 可知X(PO3)2的价带顶部由P原子、O原子以及阳离子的d轨道所占据, 而导带底部则主要由P原子、O原子以及阳离子的s、p轨道所占据, 此外P和相邻O原子的电荷密度分布图有明显重叠, 证明P-O键具有较强的共价性。X(PO3)2的静态介电常数分别为3.13、2.76、3.24。计算可知在1 064 nm处Zn(PO3)2的双折射率为0.032, Cd(PO3)2的双折射率为0.025, Hg(PO3)2的双折射率为0.024, 且通过分别计算化合物以及阴离子基团的双折射大小, 分析出材料的双折射是P-O基团和阳离子协同作用的结果。同时对材料进行布居分析, 计算元素得失电子的情况, 再次验证了P-O基团相对于Zn-O、Cd-O、Hg-O具有较强的共价性。
磷酸盐晶体 第一性原理 密度泛函理论 电子结构 光学性质 phosphate crystal first-principle density functional theory electronic structure optical property 
人工晶体学报
2023, 52(10): 1793
作者单位
摘要
华北光电技术研究所, 北京 100015
硅橡胶粘接剂具有良好的耐低温性能, 因此常被用于制冷型红外探测器复合基板的粘接工艺。研究了底涂剂对硅橡胶粘接强度的影响。拉伸试验结果表明, 直接粘接的试样在液氮温度下的平均粘接强度为4.07 MPa, 而使用底涂剂预处理的试样的平均粘接强度则达到6.34 MPa。另外, 通过观察拉伸试样断口, 发现使用底涂剂预处理的试样的断口表面有更多的硅橡胶残留。因此, 使用底涂剂预处理可以有效地增加硅橡胶的粘接强度, 有助于提高红外探测器的可靠性。
硅橡胶粘接剂 红外探测器 底涂剂 silicone rubber adhesive infrared detector primer 
红外
2021, 42(8): 13
Author Affiliations
Abstract
Wuhan National Laboratory for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Distributed optical fiber Brillouin sensors detect the temperature and strain along a fiber according to the local Brillouin frequency shift (BFS), which is usually calculated by the measured Brillouin spectrum using Lorentzian curve fitting. In addition, cross-correlation, principal component analysis, and machine learning methods have been proposed for the more efficient extraction of BFS. However, existing methods only process the Brillouin spectrum individually, ignoring the correlation in the time domain, indicating that there is still room for improvement. Here, we propose and experimentally demonstrate a BFS extraction convolutional neural network (BFSCNN) to retrieve the distributed BFS directly from the measured two-dimensional data. Simulated ideal Brillouin spectra with various parameters are used to train the BFSCNN. Both the simulation and experimental results show that the extraction accuracy of the BFSCNN is better than that of the traditional curve fitting algorithm with a much shorter processing time. The BFSCNN has good universality and robustness and can effectively improve the performances of existing Brillouin sensors.
Photonics Research
2020, 8(5): 05000690
Author Affiliations
Abstract
1 Wuhan National Laboratory for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC) R&D Center, Wuhan 430073, China
A theoretical and experimental study on curvature sensing using a Brillouin optical time-domain analyzer based on the ring-core fiber (RCF) is reported. The Brillouin gain spectrum of the RCF is investigated, and the Brillouin frequency shift (BFS) dependence on temperature and strain is calibrated. We theoretically analyze the fiber bending-induced BFS and peak Brillouin gain variation for the RCF through a numerical simulation method, and the RCF is revealed to have a high curvature sensitivity. Distributed curvature sensing is successfully demonstrated, with the bending radius ranging from 0.5 to 1.5 cm, corresponding to a BFS variation from 32.90 to 7.81 MHz. The RCF takes advantage of great bending loss resistance, and the maximum macrobending loss at the extreme bending radius of 0.5 cm is less than 0.01 dB/turn. Besides, the peak Brillouin gain of the RCF is discovered to vary significantly in response to fiber bending, which is expected to be another parameter for distributed curvature determination. The results imply that the RCF is a promising candidate for highly sensitive distributed curvature measurement, especially in sharp bending circumstances.
Photonics Research
2020, 8(2): 02000165
Author Affiliations
Abstract
1 Next Generation Internet Access National Engineering Laboratory (NGIA), School of Optical and Electronic Information, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
2 Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, South Korea
3 School of EEE, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
We propose a novel waveguide design of a polarization-maintaining few mode fiber (PM-FMF) supporting 10 non-degenerate modes, utilizing a central circular air hole and a circumjacent elliptical-ring core. The structure endows a new degree of freedom to adjust the birefringence of all the guided modes, including the fundamental polarization mode. Numerical simulations demonstrate that, by optimizing the air hole and elliptical-ring core, a PM-FMF supporting 10 distinctive polarization modes has been achieved, and the effective index difference Δneff between the adjacent guided modes could be kept larger than 1.32×10 4 over the whole C+L band. The proposed fiber structure can be flexibly tailored to support an even larger number of modes in PM-FMF (14-mode PM-FMF has been demonstrated as an example), which can be readily applicable to a scalable mode division multiplexing system.
Fibers, polarization-maintaining Fiber properties Fiber design and fabrication Fiber optics communications 
Photonics Research
2017, 5(3): 03000261

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!