中国科学院机构知识库网格系统: 检索

Comparative study on luminescence extraction strategies of LED by large-scale fabrication of nanopillar and nanohole structures 期刊论文 OAI收割
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2018, 卷号: 51, 期号: 24
作者: Ye, Jichun; Bo, Baoxue; Sun, Jie; Sheng, Jiang; Guo, Shiping

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收藏 | 浏览/下载：49/0 | 提交时间：2018/12/04

Light-emitting-diodes Photonic Crystal-structure Multiple-quantum Wells Optical-properties Output Power Efficiency Arrays Improvement Wavelength Bandgap

Comparative study on luminescence extraction strategies of LED by large-scale fabrication of nanopillar and nanohole structures 期刊论文 OAI收割
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2018, 卷号: 51, 期号: 24
作者: Ye, Jichun; Bo, Baoxue; Sun, Jie; Sheng, Jiang; Guo, Shiping

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收藏 | 浏览/下载：54/0 | 提交时间：2018/12/04

Light-emitting-diodes Photonic Crystal-structure Multiple-quantum Wells Optical-properties Output Power Efficiency Arrays Improvement Wavelength Bandgap

Multi-focus image fusion algorithm based on adaptive PCNN and wavelet transform (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Imaging Detectors and Applications, May 24, 2011 - May 26, 2011, Beijing, China
Wu Z.-G.; Wang M.-J.; Han G.-L.

收藏 | 浏览/下载：88/0 | 提交时间：2013/03/25

Being an efficient method of information fusion image fusion has been used in many fields such as machine vision medical diagnosis military applications and remote sensing.In this paper Pulse Coupled Neural Network (PCNN) is introduced in this research field for its interesting properties in image processing including segmentation target recognition et al. and a novel algorithm based on PCNN and Wavelet Transform for Multi-focus image fusion is proposed. First the two original images are decomposed by wavelet transform. Then based on the PCNN a fusion rule in the Wavelet domain is given. This algorithm uses the wavelet coefficient in each frequency domain as the linking strength so that its value can be chosen adaptively. Wavelet coefficients map to the range of image gray-scale. The output threshold function attenuates to minimum gray over time. Then all pixels of image get the ignition. So the output of PCNN in each iteration time is ignition wavelet coefficients of threshold strength in different time. At this moment the sequences of ignition of wavelet coefficients represent ignition timing of each neuron. The ignition timing of PCNN in each neuron is mapped to corresponding image gray-scale range which is a picture of ignition timing mapping. Then it can judge the targets in the neuron are obvious features or not obvious. The fusion coefficients are decided by the compare-selection operator with the firing time gradient maps and the fusion image is reconstructed by wavelet inverse transform. Furthermore by this algorithm the threshold adjusting constant is estimated by appointed iteration number. Furthermore In order to sufficient reflect order of the firing time the threshold adjusting constant is estimated by appointed iteration number. So after the iteration achieved each of the wavelet coefficient is activated. In order to verify the effectiveness of proposed rules the experiments upon Multi-focus image are done. Moreover comparative results of evaluating fusion quality are listed. The experimental results show that the method can effectively enhance the edge details and improve the spatial resolution of the image. 2011 SPIE.

An information theoretic approach to model reduction based on frequency-domain Cross-Gramian information (EI CONFERENCE) 会议论文 OAI收割
2010 8th World Congress on Intelligent Control and Automation, WCICA 2010, July 7, 2010 - July 9, 2010, Jinan, China
作者: Zhou J.

收藏 | 浏览/下载：36/0 | 提交时间：2013/03/25

We focused our attention on model reduction for linear time invariant (LTI) continuous time systems with single input and single output (SISO). We analyzed the strongpoint and shortcoming of an information theoretic approach called minimum information loss method for model reduction. We explained relationships between the steady-state information entropy and controllability information for the Gaussian systems. The controllability observability and Cross-Gramian information were analyzed in the time-domain. The frequency-domain Cross-Gramian information (FCGI) was defined based on Cross-Gramian matrix containing information associated with both controllability and observability. Furthermore a valuable application of the frequency-domain Cross-Gramian information to model reduction (FCGMIL) was developed by using the concept and properties of frequency-domain Cross-Gramian information. The performance index of FCGMIL is to minimize the frequency-domain Cross-Gramian information loss caused by eliminating the state variables with weak contributions to Cross-Gramian information over some frequency band. Two numerical examples are illustrated to verify the efficiency of FCGMIL. 2010 IEEE.

Fabrication and laser output of transparent yb : yag ceramic 期刊论文 iSwitch采集
Journal of inorganic materials, 2007, 卷号: 22, 期号: 6, 页码: 1086-1088
作者: Wu Yu-Song; Pan Yu-Bai; Li Jiang; Jiang Ben-Xue; Xu Jun

收藏 | 浏览/下载：64/0 | 提交时间：2019/05/10

Transparent ceramics Yb : yag Optical properties Laser output

Yb：YAG透明陶瓷的制备和激光输出 期刊论文 OAI收割
无机材料学报, 2007, 卷号: 22, 期号: 6, 页码: 1086, 1088
吴玉松; 潘裕柏; 李江; 姜本学; 徐军; 刘茜; 郭景坤

收藏 | 浏览/下载：1586/158 | 提交时间：2009/09/24

透明陶瓷 transparent ceramics Yb:YAG Yb : YAG 光谱性质 optical properties 激光输出 laser output

铬镱铒共掺磷酸盐玻璃的激光性质 期刊论文 OAI收割
中国激光, 2007, 卷号: 34, 期号: 2, 页码: 272, 276
陈力; 何冬兵; 李顺光; 温磊; 胡丽丽; 王标; 陈伟

收藏 | 浏览/下载：1829/284 | 提交时间：2009/09/24

材料 materials 激光性质 laser properties 铬镱铒共掺磷酸盐玻璃 Cr, Yb, Er co-doped phosphate glass 输出能量 output energy

Optical fiber transmission of Q-switdied Nd:YAG pulses of 10MW peak power: Mechanism of damage to the fiber (EI CONFERENCE) 会议论文 OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies - Advanced Optical Manufacturing and Testing Technologies, November 2, 2005 - November 5, 2005, Xian, China
作者: Wang L.

收藏 | 浏览/下载：41/0 | 提交时间：2013/03/25

This paper presents theoretical analysis and experiment results of four different fibers transmitting 10MW peak power Nd: YAG laser pulse. The main factors limiting to optical fiber transmission of high power laser pulse is pointed including air breakdown at focus area and surface damage of optical fiber. The theory of air breakdown and the fiber coupling conditions is described briefly. The results of study to the transmission properties and damage conditions are presented on the basis of four different types of optical fibers. The results of the experiments are further analyzed in the aspects of transmitting efficiency air breakdown and surface damage. The local and foreign optical fibers with plastic-cladding and silica-cladding and step- index and graded- index fibers are tested separately in the experiments. The experiments showed that the imported fibers are able to transmit up to 10MW peak power laser pulse with no any visible damage while energy density at the fiber output end surface is 3.54GW/cm2. For local fibers damage on the input surface of both plastic-cladding and silica-cladding step-index fibers was found obviously. The column damage to the graded index fiber was also found and investigated in the research. Damage mechanisms of fiber at high peak power laser pulses are summarized. High quality finishing of fiber end surface will improve damage threshold tremendously. The conclusion of the study is that transmitting Q-switched Nd:YAG pulses of 10MW peak power is feasible for the domestically made fibers if their end surfaces are properly processed.

High-power VCSELs single devices aid 2-D arrays (EI CONFERENCE) 会议论文 OAI收割
ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China
作者: Liu Y.; Wang L.; Wang L.; Wang L.; Liu Y.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

The high power bottom-emitting vertical-cavity surface-emitting lasers (VCSELs) and laser arrays emitting at 980 nm are reported. Extensive investigations on size scaling behavior of thermal properties of single devices show limits of attainable output characteristics. The maximum continuous wave (CW) output power at room temperature of single devices with aperture size up to 500 m is as high as 1.95 W. The key characteristics such as maximum output power wavelength and thermal resistance are discussed. The bottom-emitting arrays of 16 elements and 200 m aperture size of individual elements show output power of CW 1.35 W at room temperature. The far-field angle is below 17 for all driving current which is very favorable for focusing or collmating optics.

Output characteristics of electron bunch accelerated by laser pulse 期刊论文 OAI收割
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION, 2004, 卷号: 28, 页码: 308-312
作者: Hua, JF; Huo, YK; Cao, N; Lin, YZ

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收藏 | 浏览/下载：15/0 | 提交时间：2018/05/31

capture and acceleration scenario laser acceleration electron bunch output properties