期刊文献+
共找到9篇文章
< 1 >
每页显示 20 50 100
Preparations on Several GRIN Lenses
1
作者 Li Yulin, Wang Weiping, Zhang Xiangdong, Huo Junmin (Xi’an Institute of Optics & Precision Mechanics, The Chinese Academy of Sciences 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期23-24,共2页
Gradient index materials have been developed from glass melting process to GRIN lenses. Two kinds of GRIN lenses have been fabricated by ion-exchange and glass fusion/diffusion. The main applications to GRIN lenses ar... Gradient index materials have been developed from glass melting process to GRIN lenses. Two kinds of GRIN lenses have been fabricated by ion-exchange and glass fusion/diffusion. The main applications to GRIN lenses are demonstrated. 展开更多
关键词 HAVE GR of in been Preparations on Several grin lenses on
原文传递
Simple equivalent systems for GRIN lenses in inhomogeneous medium
2
作者 寿翔 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第7期647-652,共6页
Simple single-lens equivalent systems for graded-index (GRIN) lenses in inhomogeneous medium obtained using matrix optics are proposed in this letter. Due to its simplicity, the equivalent optical system enables qui... Simple single-lens equivalent systems for graded-index (GRIN) lenses in inhomogeneous medium obtained using matrix optics are proposed in this letter. Due to its simplicity, the equivalent optical system enables quick analysis of the imaging properties of GRIN lens rod immersed in inhomogeneous medium. This facilitates the optical analysis of complicated optoelectronics systems in inhomogeneous medium utilizing GRIN lens rods. 展开更多
关键词 Simple equivalent systems for grin lenses in inhomogeneous medium
原文传递
uorescence microendoscopy imaging based on GRIN lenses with one- and two-photon excitation modes 被引量:2
3
作者 Wei YAN Xiao PENG +7 位作者 Danying LIN Qi WANG Jian GAO Teng LUO Jie ZHOU Tong YE Junle QU Hanben NIU 《Frontiers of Optoelectronics》 CSCD 2015年第2期177-182,共6页
With the rapid development of life sciences, there is an increasing demand for intravital fluorescence imaging of small animals. However, large dimensions and limited working distances of objective lenses in tradition... With the rapid development of life sciences, there is an increasing demand for intravital fluorescence imaging of small animals. However, large dimensions and limited working distances of objective lenses in traditional fluorescence microscopes have limited their imaging applications mostly to superficial tissues. To overcome these disadvantages, researchers have developed the graded-index (GRIN) probes with small diameters for imaging internal organs of small animals in a minimally invasive fashion. However, dynamic imaging based on GRIN lens has not been studied extensively. Here, this paper presented a fluorescence endoscopic imaging system based on GRiN lenses using one-photon and two-photon excitation. GRIN lenses with 1.15 mm diameter and 7.65 mm length were used in the system. The images were acquired by a compact laser scanning imaging system with a resonant galvo-mirror system to scan the laser beam and a photomultiplier tube (PMT) to detect fluorescence signals. Experimental results showed that this system using two-photon excitation could implement dynamic fluorescence microendoscopic imaging and monitor the movement of blood flow beneath the skin in anesthetized mice while producing images with higher contrast and signal to noise ratio (SNR) than those using one photon excitation. It would be a useful tool for studying biological processes of small animals or plants in vivo. 展开更多
关键词 one-photon excitation two-photon excitation graded-index grin lens fluorescence micorendoscopy dynamic imaging
原文传递
GRIN光纤传输特性及其在透镜光纤耦合系统中的应用研究
4
作者 于海鹰 徐建高 +1 位作者 邹德恕 沈光地 《半导体技术》 CAS CSCD 北大核心 2005年第9期69-73,76,共6页
论述了GRIN光纤传输特性与自聚焦原理,分析了LD与光纤的耦合特性,介绍了微透镜光纤的结构、高效耦合原理与加工工艺以及技术指标。提出采用GRIN与普通光纤级联,进一步提高耦合效率和失调容差的新思路。
关键词 自聚焦光纤 透镜光纤 微透镜 光耦合模式
下载PDF
方形自聚焦透镜折射率分析 被引量:5
5
作者 陈凯 韩艳玲 周自刚 《光子学报》 EI CAS CSCD 北大核心 2008年第4期648-651,共4页
利用MATLAB偏微分方程工具箱(PDE)实现方形玻璃纤维边界条件下离子扩散的有限元解法,给出一般步骤,对离子交换制备方形自聚焦透镜过程进行计算机模拟.运用分离变量法求解方形玻璃纤维中Tl+离子浓度定解方程,由离子浓度与折射率的线性关... 利用MATLAB偏微分方程工具箱(PDE)实现方形玻璃纤维边界条件下离子扩散的有限元解法,给出一般步骤,对离子交换制备方形自聚焦透镜过程进行计算机模拟.运用分离变量法求解方形玻璃纤维中Tl+离子浓度定解方程,由离子浓度与折射率的线性关系,得到了方形自聚焦透镜折射率分布的数学表达式,计算出折射率分布图以及理论值.与实验值校验表明,相对误差小于0.33%. 展开更多
关键词 方形自聚焦透镜 离子交换 MATLAB 分离变量法
下载PDF
正方形自聚焦透镜光线理论研究 被引量:3
6
作者 陈凯 周自刚 +1 位作者 张韧 杨坤 《光子学报》 EI CAS CSCD 北大核心 2008年第9期1739-1742,共4页
针对正方形自聚焦透镜折射率分布特点,引入方向角概念,以平方律表征其折射率分布.从理论上研究了平方律折射率分布下正方形自聚焦透镜的光线轨迹方程,得到了子午光线表达式.结果表明,与传统径向自聚焦透镜相比,正方形自聚焦透镜的光线... 针对正方形自聚焦透镜折射率分布特点,引入方向角概念,以平方律表征其折射率分布.从理论上研究了平方律折射率分布下正方形自聚焦透镜的光线轨迹方程,得到了子午光线表达式.结果表明,与传统径向自聚焦透镜相比,正方形自聚焦透镜的光线轨迹受光线入射方向角影响,会产生较大像差.得到了正方形自聚焦透镜数值孔径表达式,表明数值孔径并非常量,且与方向角密切相关.计算了中心轴上的最大数值孔径,方向角为0°时最小为0.405,方向角为45°时最大值0.5以上. 展开更多
关键词 正方形自聚焦透镜 折射率分布 子午光线轨迹 数值孔径
下载PDF
一种新颖的光纤强度调制加速度传感器研究 被引量:2
7
作者 李建林 陈陶 《计算机测量与控制》 北大核心 2013年第10期2882-2884,共3页
设计了一种新颖的透射式强度调制光纤加速度传感器,利用人射光纤直接作悬臂梁和敏感质量块,采用双自聚焦透镜(光纤准直器)接收光束,经过相减运算,提高了光路的光耦合效率并使光源扰动、温度等干扰因素的影响得到有效地补偿,给出... 设计了一种新颖的透射式强度调制光纤加速度传感器,利用人射光纤直接作悬臂梁和敏感质量块,采用双自聚焦透镜(光纤准直器)接收光束,经过相减运算,提高了光路的光耦合效率并使光源扰动、温度等干扰因素的影响得到有效地补偿,给出了模拟仿真计算和初步实验结果;模拟计算和实验数据表明,在0~500N·m。测量范围内该加速度传感器具有良好的线性度和温度稳定性。 展开更多
关键词 光纤传感器 加速度传感器 强度调制 聚焦透镜
下载PDF
非线性锥形梯度折射率透镜的光学特征
8
作者 陈智浩 《量子电子学》 CAS CSCD 1992年第2期153-155,共3页
本文对非线性锥形梯度折射率透镜进行了分析,根据稳态自聚焦理论以及ABCD定律,导出了高斯光束通过这种透镜光斑尺寸及其位置的公式。讨论了几种特殊的情况,得到了一些重要的结果。
关键词 锥形梯度 折射率 透镜 非线性
下载PDF
Fabrication method of ultra-small gradient-index fiber probe 被引量:1
9
作者 Chi Wang Fang Zhang +2 位作者 Shu-Bo Bi Xue-Qin Xia Ting-Ting Xu 《Advances in Manufacturing》 SCIE CAS 2014年第4期327-332,共6页
Fabrication method and device of ultra-small gradient-index (GRIN) fiber probe were investigated in order to explore the development of ultra-small probes for optical coherence tomography (OCT) imaging. The beam- ... Fabrication method and device of ultra-small gradient-index (GRIN) fiber probe were investigated in order to explore the development of ultra-small probes for optical coherence tomography (OCT) imaging. The beam- expanding effect of no-core fiber (NCF) and the focusing properties of the GRIN fiber lens were analyzed based on the model of GRIN fiber probe consisting of single-mode fiber (SMF), NCF and GRIN fiber lens. A stereo micro- scope based system was developed to fabricate the GRIN fiber probe. A fiber fusion splicer and an ultrasonic cleaver were used to weld and cut the fiber respectively. A con- focal microscopy was used to measure the dimensions of probe components. The results show that the sizes of probe components developed are at the level of millimeter. Therefore, the proposed experimental system meets the fabrication requirements of an ultra-small self-focusing GRIN fiber probe. This shows that this fabrication device and method can be employed in the fabrication of ultra- small self-focusing GRIN fiber probe and applied in the study of miniaturized optical probes and OCT systems. 展开更多
关键词 Optical coherence tomography (OCT) Gradient-index grin fiber probe grin fiber lens No-core fiber (NCF)
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部