Sixteenth National Conference on Laser Technology and Optoelectronics最新文献_第6页

Effect and mechanism of initial phase on electron radiation under linearly polarized Gaussian laser pulse 线偏振高斯激光脉冲下初始相位对电子辐射的影响及其机理

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600776

P. Yu, Yiqiu Wang, Jingjing Yan, Jianping Chang, Youwei Tian

引用次数: 0

Tuning of opto-electonic properties of SiC by laser irradiation 激光辐照碳化硅的光电特性调谐

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602889

L. Ji, A. M. Jadoon, Zhenyuan Lin, Yan Wu, Litian Zhang, Jincan Zheng

引用次数: 0

Parameters optimization of short pulse laser milling Inconel 718 laser deposition manufacturing parts 短脉冲激光铣削Inconel 718激光沉积制造零件的参数优化

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602596

Yufan Liu, Zifa Xu, Wentai Ouyang, Mina Zhang, Q. Zou, J. Jiao, Zheng Liu, Wenwu Zhang

引用次数: 0

Distributed Brillouin temperature sensing based on single-photon detector in optical fiber 基于光纤单光子探测器的分布式布里渊温度传感

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2601785

Liwen Sheng, Jisong Yan, Lin Huang, M. Yuan, Qiao Shan, Zhang Aiguo, Jiaqing Liu, Li Ligong, F. Nian, Shuai Zhou

引用次数: 0

High fidelity image reconstruction of light passing through scattering medium based on convolutional neural network 基于卷积神经网络的光通过散射介质的高保真图像重建

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603144

Zhaoyang Tang, Chengchao Xiang, Qixin Liu, Yue Dai, Jiaqi He, Yingchun Ding

{"title":"High fidelity image reconstruction of light passing through scattering medium based on convolutional neural network","authors":"Zhaoyang Tang, Chengchao Xiang, Qixin Liu, Yue Dai, Jiaqi He, Yingchun Ding","doi":"10.1117/12.2603144","DOIUrl":"https://doi.org/10.1117/12.2603144","url":null,"abstract":"Optical imaging through scattering media such as ground glass, fog, biological tissues, etc. has always been a widely used and challenging task in the optical field. Compared with traditional imaging methods such as transmission matrix and optical phase conjugation, deep learning has shown great potential in this field because of its simple device and fast reconstruction speed. In this article, we developed an algorithm based on convolutional neural network to realize imaging through scattering media and applied this algorithm to recover complex images. The speckle images of the original images are obtained through a speckle generation program, and then the speckle images and the original images are input into the neural network in pairs for training. Finally, the reconstructed speckle images can be obtained by using the trained neural network. In the numerical simulation, we proposed two indicators, peak signal-to-noise ratio (PSNR) and structural similarity (SSIM), to evaluate the quality of reconstructed images. The results show that our method can restore highfidelity images. This new image reconstruction method provides new ideas for research in the fields of astronomy and biomedicine.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130069218","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

Influence of electron’s initial position on space radiation of a high-energy electron interacting with linearly polarized tightly focused laser 电子初始位置对高能电子与线偏振紧聚焦激光相互作用空间辐射的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600773

Xi Zhou, Yilv Yan, S. Ren, Hui Liu, Youwei Tian

{"title":"Influence of electron’s initial position on space radiation of a high-energy electron interacting with linearly polarized tightly focused laser","authors":"Xi Zhou, Yilv Yan, S. Ren, Hui Liu, Youwei Tian","doi":"10.1117/12.2600773","DOIUrl":"https://doi.org/10.1117/12.2600773","url":null,"abstract":"The scattering model of a single high-energy electron interacting with a Gaussian laser pulse is constructed according to the Lagrange’s equation, and the trajectory of the electron and the radiation characteristics of the scattered light are simulated by MATLAB, also, the influence of the initial position of the electron on the space energy radiation is discussed in detail. The results show that the initially static high-energy electron first oscillates in the +z direction in a plane, and then travels along a straight line after interacting with the linearly polarized tightly focused intense laser. As the initial position of the electron moves to the positive direction of z axis, the azimuth angle of the maximum energy radiation direction remains unchanged at 180°, while the polar angle gradually decreases and finally stabilizes at 20.5°. The maximum radiation energy in the whole space is obtained when the electron is initially set at (0,0,−7λ0 ) with the polar angle and the azimuth angle being 23.5° and 180° respectively, and the corresponding time evolution and spectrum of the process are discussed qualitatively.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129994795","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

Dual-band terahertz biosensor based on metamaterial absorber 基于超材料吸收体的双频太赫兹生物传感器

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603109

Huan Liu, Jing Ma, Gui-Min Chen, Hai-Ling He, Ya-Xian Fan, Z. Tao

{"title":"Dual-band terahertz biosensor based on metamaterial absorber","authors":"Huan Liu, Jing Ma, Gui-Min Chen, Hai-Ling He, Ya-Xian Fan, Z. Tao","doi":"10.1117/12.2603109","DOIUrl":"https://doi.org/10.1117/12.2603109","url":null,"abstract":"Traditional biological detection methods in practical applications, such as polymerase chain reaction, fluorescence microscopy, flow cytometry and so on, are commonly limited by label needed, high cost, complex operation, low sensitivity. Fortunately, metamaterial-based terahertz (THz) biosensors have shown great potential in label-free, integrated chip and ultra-sensitive sensing due to their advantages in light collection and miniaturization. However, most of THz metamaterial biosensors are based on transmission spectrum measurement, the one-way transmission will lead to the weak interactions between analyte and THz wave, so the sensitivity will be greatly reduced. Here, we proposed a label-free dual-band THz biosensor with ultra-high sensitivity based on metamaterial absorber. The device consists of the asymmetric cross shaped metal metasurface, hollow sensing channel and a back reflector. The simulation results show that the two resonance modes are excited at 0.626 THz and 1.504 THz and the absorptivity is higher than 95%. With the increasing the refractive index of the analyte, the two absorption peaks have obvious red shift. The maximum sensitivities for mode A and mode B are up to 250 GHz/RIU and 630 GHz/RIU, respectively. By simulating the electromagnetic field distribution of the structure, the absorption sensing mechanism is discussed in detail. The proposed THz metamaterial biosensor exhibits promising applications in chemical and biological detection.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130439764","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

Simulation of time-stretched photon Doppler velocimetry 时间拉伸光子多普勒测速的仿真

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603239

Tengfei Wu, Linjie Lv, Jibo Han, Da-zhi Zhang, Zhiguo Liang

引用次数: 0

Three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy 大体积光学分辨率光声显微镜的三维融合

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603388

Xiongjun Cao, Zhihui Li, Xianlin Song

{"title":"Three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy","authors":"Xiongjun Cao, Zhihui Li, Xianlin Song","doi":"10.1117/12.2603388","DOIUrl":"https://doi.org/10.1117/12.2603388","url":null,"abstract":"Photoacoustic imaging has gradually developed into a new and important imaging technology. As an important branch of photoacoustic imaging, optical-resolution photoacoustic microscopy combines the advantages of optical imaging and acoustic imaging, it has the advantages of high resolution, high contrast, high sensitivity and so on. However, in order to obtain high resolution, it is often necessary to focus the laser beam strongly, which will lead to the small depth of field and the inability to obtain large-scale structural information. However, in clinical diagnosis, doctors hope to obtain large-scale, high-resolution structural and functional information as much as possible, so it is of great significance to solve the problem of small depth of field in photoacoustic microscopy. Here, we proposed three-dimensional fusion for large volumetric optical-resolution photoacoustic microscopy. Firstly, two groups of virtual cerebral vascular 3D photoacoustic data obtained at different focal locations were obtained by using virtual photoacoustic microscopic imaging platform. Then, based on the multi-scale weight gradient fusion algorithm, the B-scan data of mouse cerebrovascular data were fused, and the maximum projection reduction was performed on the fused 3D data. Finally, the images before and after fusion were compared. Experimental results show that this algorithm can effectively obtain large volumetric and high-resolution photoacoustic images.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124331794","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: 2

Research on the linearity degradation caused by noise in microwave photonic temperature sensor with fiber ring structure 光纤环结构微波光子温度传感器中噪声引起的线性退化研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603173

Mengmeng Wu, Ruimin Shi, Yinshen Qin, Jundong Ye, Qianmei Chen

{"title":"Research on the linearity degradation caused by noise in microwave photonic temperature sensor with fiber ring structure","authors":"Mengmeng Wu, Ruimin Shi, Yinshen Qin, Jundong Ye, Qianmei Chen","doi":"10.1117/12.2603173","DOIUrl":"https://doi.org/10.1117/12.2603173","url":null,"abstract":"When the optical fiber ring is used as interferometer in microwave photonics (MWP) filter, researchers usually pay much attention to the sensing sensitivity, but are lack of experimental research on the deterioration of sensing linearity caused by the noise in this structure. Therefore, this paper studies the deterioration of the temperature sensing linearity in MWP filter, which is caused by the noise in optical fiber ring structure. In experiment, a sinusoidal microwave signal with the radio frequency(RF) amplitude of 4Vpp and the frequency range of 127MHz -147MHz are selected to modulate the broad-band light, and the bias voltage of the electro-optic modulator(EOM) is 3V. In the experiment, the 50m sensing fiber is heated, with the temperature range of 25°C-55°C. The filtered microwave signal is realized by the beating process in photodiode(PD), and then the signal is sent to the electrical spectrum analyzer (ESA). When the RF sweeping curves are recorded, the maximum peak detection(MPD) method is used to extract the resonant frequency of two resonant peaks at different temperatures respectively. Finally, the mean values of these resonant frequencies are calculated, and the first and multiple order polynomial is used to fit the above data. These results show that the resonant frequencies corresponding to different resonant peaks vary with the temperature with poor linearity. The first order fitting R-square of the resonant peak 1 and peak 2 are only 0.3855 and 0.2545, while the quartic fitting R-square can reach 0.8583 and 0.9589. It can be seen that there is a large noise in the optical fiber ring structure, which seriously affects the sensing performance of the MWP filter.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121304216","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