Photonics Asia最新文献_第10页

Size-dependent amplitude and phase distribution under a high NA objective 高NA物镜下大小相关的振幅和相位分布

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071393

Xin Hong, Huan Liu

引用次数: 1

High side-mode suppression ratio laser output by single sideband injection locking of semiconductor lasers 利用半导体激光器的单边带注入锁定实现高边模抑制比的激光输出

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2074234

Jian Wang, Dijun Chen, H. Cai, R. Qu, W. Fang, Z. Fang

引用次数: 1

Enhancement display of veins distribution based on binocular vision and image fusion technology 基于双目视觉和图像融合技术的静脉分布增强显示

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2070929

Peng Liu, Si Di, Jian Jin, Liping Bai

{"title":"Enhancement display of veins distribution based on binocular vision and image fusion technology","authors":"Peng Liu, Si Di, Jian Jin, Liping Bai","doi":"10.1117/12.2070929","DOIUrl":"https://doi.org/10.1117/12.2070929","url":null,"abstract":"The capture and display of veins distribution is an important issue for some applications, such as medical diagnosis and identification. Therefore, it has become a popular topic in the field of biomedical imaging. Usually, people capture the veins distribution by infrared imaging, but the display result is similar with that of a gray picture and the color and details of skin cannot be remained. To some degree, it is unreal for doctors. In this paper, we develop a binocular vision system to carry out the enhancement display of veins under the condition of keeping actual skin color. The binocular system is consisted of two adjacent cameras. A visible band filter and an infrared band filter are placed in front of the two lenses, respectively. Therefore, the pictures of visible band and infrared band can be captured simultaneously. After that, a new fusion process is applied to the two pictures, which related to histogram mapping, principal component analysis (PCA) and modified bilateral filter fusion. The final results show that both the veins distribution and the actual skin color of the back of the hand can be clearly displayed. Besides, correlation coefficient, average gradient and average distortion are selected as the parameters to evaluate the image quality. By comparing the parameters, it is evident that our novel fusion method is prior to some popular fusion methods such as Gauss filter fusion, Intensity-hue-saturation (HIS) fusion and bilateral filter fusion.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115040060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of nonlinear self-focusing phenomenon in high-power laser system based on ray-tracing 基于光线追踪的大功率激光系统非线性自聚焦现象分析

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071845

Weiwei Wang, Xiao-tong Li, Z. Cen, Luwei Zhang

引用次数: 0

Role of laser fluence in protein synthesis of cultured DRG neurons following low-level laser irradiation 激光辐照对培养DRG神经元蛋白合成的影响

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071447

Liqin Zheng, Caimin Qiu, Yu-hua Wang, Yixiu Zeng, Hongqin Yang, Yanding Zhang, S. Xie

{"title":"Role of laser fluence in protein synthesis of cultured DRG neurons following low-level laser irradiation","authors":"Liqin Zheng, Caimin Qiu, Yu-hua Wang, Yixiu Zeng, Hongqin Yang, Yanding Zhang, S. Xie","doi":"10.1117/12.2071447","DOIUrl":"https://doi.org/10.1117/12.2071447","url":null,"abstract":"Low-level lasers have been used to relieve pain in clinical for many years. But the mechanism is not fully clear. In animal models, nitric oxide (NO) has been reported involving in the transmission and modulation of nociceptive signals. So the objective of this study was to establish whether low-level laser with different fluence could stimulate the production of nitric oxide synthese (NOS), which produces NO in cultured primary dorsal root ganglion neurons (DRG neurons). The primary DRG neurons were isolated from healthy Sprague Dawley rats (8-12 weeks of age) and spread on 35 mm culture dishes specially used for confocal microscopy. 24 hours after spreading, cells were irradiated with 658 nm laser for two consecutive days at the energy density of 20, 40, 60 and 80 mJ·cm-2 respectively. Control groups were not exposed to the laser, but were kept under the same conditions as the irradiated ones. The synthesis of NOS after laser irradiation was detected by immunofluorescence assay, and the changes of NOS were evaluated using confocal microscopy and Image J software. The results showed that all the laser fluence could promote the production of NOS in DRG neurons, especially the 60 mJ·cm-2 . These results demonstrated that low-level laser irradiation could modify protein synthesis in a dose- or fluence- dependent manner, and indicated that low-level laser irradiation might achieve the analgesic effect through modulation of NO production.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133288197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a sub-petawatt ultrashort laser facility 亚拍瓦超短激光设备的研制

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071011

Xiao-dong Wang, Q. Zhu, Jing-qin Su, N. Xie, Dongbin Jiang, K. Zhou, Xiao-jun Huang, X. Zeng, Yi Guo, Li Sun, Qing Li

引用次数: 0

High-speed quantitative interferometric microscopy based phase imaging cytometer 高速定量干涉显微相成像细胞仪

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2070398

Liang Xue, Nan Sun, Keding Yan, Fei Liu, Shouyu Wang

引用次数: 0

The evaluation and planning of light dose in photodynamic therapy for port wine stains 葡萄酒色斑光动力治疗中光剂量的评价与规划

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071307

Feng-juan Zhang, Xiaoming Hu, Qishen Zhang

引用次数: 2

Analysis of temporal contrast degradation due to wave front deviation in large aperture ultra-short pulse focusing system 大口径超短脉冲聚焦系统中波前偏差引起的时间对比度下降分析

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2074476

P. Zhu, Xinglong Xie, Jianqiang Zhu, Haidong Zhu, Qingwei Yang, Jun Kang, Ailin Guo, Qi Gao

{"title":"Analysis of temporal contrast degradation due to wave front deviation in large aperture ultra-short pulse focusing system","authors":"P. Zhu, Xinglong Xie, Jianqiang Zhu, Haidong Zhu, Qingwei Yang, Jun Kang, Ailin Guo, Qi Gao","doi":"10.1117/12.2074476","DOIUrl":"https://doi.org/10.1117/12.2074476","url":null,"abstract":"In extremely intense laser system used for plasma physics experiments, temporal contrast is an important property of the ultra-short pulse. In this paper, we theoretically study the temporal contrast degradation due to wave front deviation in large aperture ultra-short pulse focusing system. Two-step focusing fast Fourier transform (FFT) algorithm with the coordinate transform based on Fresnel approximation in space domain and Fourier integral transform method in time domain were used to simulate the focusing process spatially and temporally, in which the spatial distribution of ultra-short pulse temporal contrast characteristics at the focal spot is related to the wave front in large aperture off-axis parabolic mirror focusing optical system. Firstly, temporal contrast degradation due to wave front noise with higher spatial frequency is analyzed and appropriate evaluation parameter for large aperture ultra-short pulse focusing system is put forward from the perspective of temporal contrast. Secondly, the influence of wave front distortion with lower spatial frequency on temporal contrast is revealed comparing different degradation characteristics of various aberrations. At last, a method by controlling and optimizing the wave front to prevent temporal contrast degradation in large aperture ultra-short laser system is proposed, which is of great significance for high temporal contrast petawatt laser facilities.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130420105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The simulation of light distribution in photodynamic therapy for port wine stains 葡萄酒色斑光动力治疗中的光分布模拟

Photonics Asia Pub Date : 2014-11-18 DOI: 10.1117/12.2071537

Shi-yu Zhang, Xiaoming Hu, Ya Zhou

引用次数: 2