Sixteenth National Conference on Laser Technology and Optoelectronics最新文献_第7页

Improve the performance of 2μm GaSb-based high-power lasers by reducing the thermal effect of series resistance 通过减小串联电阻的热效应，提高基于2μm gasb的大功率激光器的性能

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603171

Yi-hang Chen, Yi Zhang, Chengao Yang, Jin-ming Shang, Tian-fang Wang, Haiteng Wang, Xu Yingqiang, Yu Zhang, Niu Zhichuan

引用次数: 0

In-vivo characterization of zebrafish bone degradation and regeneration models by optical coherence tomography 光学相干断层成像技术在体内表征斑马鱼骨降解和再生模型

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603248

Weijian Gao, Mengyu Zhou, Jing Huang, Shuqi Gan, Yao Xu, Ting Lu, Yiqing Zhang, Jian Zhang

引用次数: 0

Real-time detection of atmospheric fine particle mass concentration based on laser forward small angle scattering 基于激光前向小角散射的大气细颗粒物质量浓度实时检测

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603157

Heng Zhao, Rongrui Zhang

{"title":"Real-time detection of atmospheric fine particle mass concentration based on laser forward small angle scattering","authors":"Heng Zhao, Rongrui Zhang","doi":"10.1117/12.2603157","DOIUrl":"https://doi.org/10.1117/12.2603157","url":null,"abstract":"The level of fine particulate air pollution exposure is positively correlated with the death rate of individuals infected with COVID-19. Monitoring is the first step to prevent fine particulate pollution. The instrument based on light scattering method to detect particle concentration has unparalleled advantages over other instruments due to its rapidity, real-time and low cost. Traditional light scattering instruments are limited by the light absorption and particle properties of particles, and their ability to monitor some particles with strong light absorption is greatly reduced. Moreover, when the measured environment is greatly different from the calibration environment, the measurement results often have large errors. In this research, an instrument is designed to detect the forward scattering of light from small angles of particles. It can monitor the number concentration of particles in the environment in real time in four particle size ranges (PM1, PM2.5, PM4 and PM10) and convert it into the mass concentration of particles. By using the simulated atmospheric smoke box and the standard instrument to conduct a field comparison experiment, the reliability and stability of the measurement results are verified.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"70 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":"121707453","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

Suppression RIN of CW fiber laser by nonlinear absorption effect 利用非线性吸收效应抑制连续波光纤激光器的RIN

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2601001

Weiqian Zhao, Chun Yang

引用次数: 0

Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing 激光增材制造原位mc增强CoCrMoNbTi高熵合金涂层的组织与力学性能

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603053

L. He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan

{"title":"Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing","authors":"L. He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan","doi":"10.1117/12.2603053","DOIUrl":"https://doi.org/10.1117/12.2603053","url":null,"abstract":"In situ carbides (TiC/Cr7C3) reinforced CoCrMoNbTiC0.2 high-entropy alloy coatings were prepared on the Ti-6Al- 4V titanium alloy substrate by laser melting deposition technology. Effect of the laser power on the surface morphology, phase consistent, microstructure and microhardness were investigated. The results show that the coatings were composed of a simple BCC solid solution and a small amount of TiC and Cr7C3 carbides. The in-situ MC (TiC/Cr7C3) carbides were evenly distributed in the BCC matrix. The laser power has a significant impact on the forming quality and mechanical properties of the coatings. As the optimal laser power of 1500 W were applied, the coating mostly free of defects exhibited a fine dendritic microstructure. With the increasing laser power, the microhardness of the coatings was first increased and then decreased gradually. The highest microhardness of the coating (1500 W) was up to 650 HV0.5, which was 2 times higher than that of the substrate. The excellent mechanical properties of the coatings were attributed to the synergetic effects of the second phase strengthening, solid solution strengthening and fine microstructure.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"38 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":"124874524","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

Directional effect and surface features of silicon nitride ceramics by laser spot ablation and microgrooving 激光点烧蚀和微沟槽制备氮化硅陶瓷的定向效应和表面特征

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603271

Guiying Ma, Xiaoxiao Chen, Yang Liu, Huihui Zhang, Wenwu Zhang

{"title":"Directional effect and surface features of silicon nitride ceramics by laser spot ablation and microgrooving","authors":"Guiying Ma, Xiaoxiao Chen, Yang Liu, Huihui Zhang, Wenwu Zhang","doi":"10.1117/12.2603271","DOIUrl":"https://doi.org/10.1117/12.2603271","url":null,"abstract":"Due to excellent properties such as high hardness, high temperature resistance, corrosion resistance and low thermal conductivity, siliconnitrideceramicsare widely used in aerospace, moldand semiconductor fields. This paper studied the material removal characteristics of fixedpoint laser ablation and microgrooving of silicon nitride ceramics in the cross-coupling energy domain after laser beam splitting and combining. When using nanosecond laser for fixed point ablation, the effect of defocus on the surface characteristics of laser ablation was analyzed. When processing surface microgrooves in different directions, the influence of the directional effect of the spatial characteristics of the coupled energy domain on the processing quality was studied. By test and analysis of the surface morphology characteristics of silicon nitride ceramics, the results show thatthe change of the defocus affects the processing depthwhen a fixed point is ablatedin the cross-coupling energy domain. Thedirection effect of microgroove processing has a more significant effect on the surface characteristics.","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":"129653552","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

Quantitative analysis of organics based on terahertz frequency-domain spectroscopy 基于太赫兹频域光谱的有机物定量分析

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603032

Xing-yue Li, Zhaohui Zhang, Xiaoyan Zhao, Tian-yao Zhang

{"title":"Quantitative analysis of organics based on terahertz frequency-domain spectroscopy","authors":"Xing-yue Li, Zhaohui Zhang, Xiaoyan Zhao, Tian-yao Zhang","doi":"10.1117/12.2603032","DOIUrl":"https://doi.org/10.1117/12.2603032","url":null,"abstract":"Traditional terahertz time-domain spectroscopy (THZ-TDS) can provide a broadband spectral response of the measured object and has been widely used. Notwithstanding, for applications that require real-time quantitative detection such as security inspection, more attention should be paid to the terahertz response around the absorption characteristics of the sample. Terahertz frequency domain spectroscopy (THz-FDS) using frequency modulation continuous wave can better meet the real-time requirements of security applications. In this paper, an analytical method is established to achieve accurate prediction of molar concentration for organics. The absorption coefficient spectra of samples with different molar concentrations are obtained by using traditional THz-TDS in a wide frequency range, and then the THz-FDS based on photomixing technology is applied to locking a narrow band range near the absorption peak for rapid quantitative analysis. The scheme was verified by taking α-lactose monohydrate as an example, and the results showed that the mean square error of concentration prediction was only 0.025 under the interference of water vapor environment. It may shed light on terahertz rapid quantitative detection of organic compounds in realistic security scene.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"84 6 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":"128777000","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

Effect of UV irradiation on photo-thermo induced nucleation of PTR glass 紫外光照射对PTR玻璃光热诱导成核的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602971

Ge Ziyi, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan

引用次数: 0

A satellite photon-counting laser altimeter calibration algorithm using CCRs and indirect adjustment 一种基于ccr和间接平差的卫星光子计数激光高度计标定算法

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603099

Yalei Guo, Huan Xie, Qi Xu, Xiaoshuai Liu, Xu Wang, Binbin Li, X. Tong

{"title":"A satellite photon-counting laser altimeter calibration algorithm using CCRs and indirect adjustment","authors":"Yalei Guo, Huan Xie, Qi Xu, Xiaoshuai Liu, Xu Wang, Binbin Li, X. Tong","doi":"10.1117/12.2603099","DOIUrl":"https://doi.org/10.1117/12.2603099","url":null,"abstract":"High precision on-orbit geometric calibration technology is the key to obtaining high precision satellite laser altimeters. Different from the traditional full-waveform laser altimeter, the single-photon laser altimeter has the characteristics of high repetition frequency and small footprint. These characteristics put forward new requirements for on-orbit geometric calibration. Aiming at the characteristics of the single-photon laser altimeter, this paper proposes a pointing angle and range calibration algorithm based on a Corner Cube Retro-Reflectors (CCRs). The algorithm determines the position of the CCR closest to the center of the footprint based on the photon signal returned by the CCR deployed on the ground, and unifies the natural ground and the laser footprint and establishes an on-orbit geometric calibration model. Through 8 sets of control experiments, the system errors of 30 second,60 second and 90 second are added to the pointing angle, and the system errors of -3m,-4m,-6m and -9m are added to the range. After using this algorithm for calibration, The average elevation deviation is decreased from more than 86m to less than 1m. The results show that the CCR-based pointing angle and range calibration algorithm can better restore the added system error, and can effectively improve the data accuracy of the laser altimeter.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"64 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":"126383624","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

Numerical demonstration of a multistage cascaded Raman soliton shift structure in mid-infrared region 中红外区域多级级联拉曼孤子位移结构的数值模拟

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603006

Yiwei Hou, Qi Wu, Xiaodong Wu, Fei Liu, Hongyu Luo, Jianfeng Li

引用次数: 0