Sixteenth National Conference on Laser Technology and Optoelectronics最新文献_第8页

Experimental study on infrared water guided laser cutting of 7075 aluminum alloy 7075铝合金红外水导激光切割实验研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603052

Zebin Pan, Guangyi Zhang, Chunhai Guo, Yang Chao, Yaowen Wu, Huan Long, Wenwu Zhang

{"title":"Experimental study on infrared water guided laser cutting of 7075 aluminum alloy","authors":"Zebin Pan, Guangyi Zhang, Chunhai Guo, Yang Chao, Yaowen Wu, Huan Long, Wenwu Zhang","doi":"10.1117/12.2603052","DOIUrl":"https://doi.org/10.1117/12.2603052","url":null,"abstract":"As a novel composite processing technology, water guided laser has the advantages of small heat affected zone, good surface quality of the cut surface, strong processing depth capability and small taper compared with the traditional dry laser processing technology. In this paper, the infrared water guided laser processing technology is used to process 7075 aluminum alloy, which has high strength, high toughness and corrosion resistance and is widely used in the fields of aerospace, mechanical equipment. The processing parameters of the infrared water guided laser including the effect of 7075 aluminum alloy on the cutting depth, kerf width and surface quality at different feed speed, number of cutting times and peak power are analyzed to extend the processing method of 7075 aluminum alloy. The distance-power curve was also derived based on the fact that the further the power meter was from the nozzle, the lower the power measured within the water column. The experimental results show that the faster the 7075 aluminum alloy feed speed is, the shallower the cutting depth and the smaller the kerf width is, while the higher the number of cuts and the higher the peak power are, both will result in large cutting depth and kerf width. Finally, high quality cutting through and punching of 3mm aluminum alloy plate is achieved, which provides the theoretical basis for the study to infrared water guided laser.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"21 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":"128527285","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

Sub-aperture field of view mismatch in differential synthetic aperture ladar 差分合成孔径雷达子孔径视场失配问题

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602024

G. Zhang, Yebin Zhang, Kai Wang, Shoubao Han, Zhong Zhou, Chao Li, Lei Wang

引用次数: 0

Processing study of laser marking on Si wafer 硅晶片激光打标工艺研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603103

Lingling Zhang, Tianjiao Shu, Guo-quan Li, Yuanchao Du, Yuan Chen, Xuanjun Zhang, J. Zhang

引用次数: 0

Dynamic multiple beam forming based on the fiber laser phased array 基于光纤激光相控阵的动态多波束形成

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2601327

Guan Huang, Guoyun Lv, Yangyu Fan

引用次数: 0

Optimization of diffusion bonding process for QPM GaAs crystals QPM GaAs晶体扩散键合工艺的优化

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602985

Chenxu Wang, H. Bian, Zhanda Zhu, Yongling Hui, H. Lei, Qiang Li

引用次数: 0

Study on the characteristics of underwater target laser echo based on pulse broadening 基于脉冲展宽的水下目标激光回波特性研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603111

Yujia Wang, S. Zong, Xin Zhang

{"title":"Study on the characteristics of underwater target laser echo based on pulse broadening","authors":"Yujia Wang, S. Zong, Xin Zhang","doi":"10.1117/12.2603111","DOIUrl":"https://doi.org/10.1117/12.2603111","url":null,"abstract":"Background interference of impurity in strong water is the key factor restricting the detection distance and target characteristics of the weak target. Aiming at the problems of less echo characteristics and difficult identification of the characteristics of the underwater weak target laser detection, the paper studies the problem of the broadening of the laser echo pulse of the weak target under the background of strong water interference. A system of underwater weak target laser measurement and analysis is designed to suppress the near-field water scattering interference. The system can achieve matching adjustment among laser emission energy, laser beam angle and laser APD receiving gain. The detection performance of different underwater weak targets (small-scale metal, black rubber, low reflectivity reef, water grass, transparent plastic) was tested under different laser emission energy, different detection distance and different laser echo receiving gain. Through statistical analysis of data, the pulse width and material of the target of different underwater weak targets were obtained The relationship between the power of pulse laser, the distance between laser emission and target. The results show that the pulse broadening characteristics of the laser echo signal can be used to identify the weak target laser detection characteristics under the background of strong water impurity interference.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"278 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120879203","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

Generation of a quasi-monochromatic x-ray via collision of electron with tightly focused laser pulses 电子与紧聚焦激光脉冲碰撞产生准单色x射线

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600762

J. Zhuang, Yiqiu Wang, Conglin Wang, Youwei Tian

{"title":"Generation of a quasi-monochromatic x-ray via collision of electron with tightly focused laser pulses","authors":"J. Zhuang, Yiqiu Wang, Conglin Wang, Youwei Tian","doi":"10.1117/12.2600762","DOIUrl":"https://doi.org/10.1117/12.2600762","url":null,"abstract":"The nonlinear Thomson backscattering process of electron under circularly polarized laser pulses is studied. The influence of the central collision position of the electron and laser pulses on the spectral characteristics of the scattered light is analyzed. The results show that the frequency broadening caused by doppler nonlinear frequency shift can be reduced and the monochromicity of the emitted light can be improved by adjusting the central collision position or the initial position of electron appropriately. At the same time, taking the requirements for the radiation intensity of scattered light into account, the optimal situation to generate quasi-monochromatic x-rays is presented. Besides, a scheme to increase the radiation energy of backscattered light by controlling the laser pulse width is proposed without changing the frequency band width. It provides a solution to overcome the problem that the radiation energy is too weak in the scheme of changing the initial position of electron. In addition, it was found that the interference fringes of the emitted light growing greatly as the pulse width increases.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"12367 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":"116178869","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

Extraction of forward small angle particle scattering light pulse signal based on variable forgetting factor RLS algorithm 基于变遗忘因子RLS算法的前向小角度粒子散射光脉冲信号提取

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603148

Rongrui Zhang, Heng Zhao

{"title":"Extraction of forward small angle particle scattering light pulse signal based on variable forgetting factor RLS algorithm","authors":"Rongrui Zhang, Heng Zhao","doi":"10.1117/12.2603148","DOIUrl":"https://doi.org/10.1117/12.2603148","url":null,"abstract":"Small angle light scattering measurement is more relevant for determining the size of solid aerosols, but small scattering angle measurement results will be interfered by larger stray light. The key technology is to suppress the background noise caused by the Fraunhofer diffraction of the laser light source and the Rayleigh scattering of atmospheric molecules, so as to improve the resolution of weak scattered light signal of strong light absorption small particle aerosol. An adaptive filtering method of forward small angle aerosol scattering signal is proposed based on recursive least-square (RLS) algorithm. By analyzing the characteristics of small-angle aerosol detection signals, the forgetting factor in traditional RLS is optimized, so that it can not only distinguish aerosol scattered light signals from stray light signals, but also dynamically adjust according to the amplitude change under different particle size and absorbance. In order to verify the filtering effect, small angle scattering light pulse extraction experiments of aerosols with different absorbance and different particle sizes were conducted in a simulated smoke box. Experiments show that the proposed variable forgetting factor RLS algorithm can effectively suppress stray light signals caused by laser light sources and atmospheric molecules. When the aerosol detection signal appears, the algorithm has fast convergence speed and tracking speed, which highlights the aerosol pulse signal well. Compared with the traditional method, the resolution of the processed aerosol scattering pulse signal increases dramatically and has a great advantage in the extraction of weak scattering pulse signal.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"8 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":"124982725","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

Raman analysis of the microstructures of nano-silicon coatings grown on different substrates 不同衬底生长的纳米硅涂层微观结构的拉曼分析

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602897

Li Wang, B. Dong, Jin Yang, Shikun He, Yunli Bai, Gang Wang

{"title":"Raman analysis of the microstructures of nano-silicon coatings grown on different substrates","authors":"Li Wang, B. Dong, Jin Yang, Shikun He, Yunli Bai, Gang Wang","doi":"10.1117/12.2602897","DOIUrl":"https://doi.org/10.1117/12.2602897","url":null,"abstract":"5μm thickness silicon coatings were deposited on RB-SiC、S-SiC、Si and Bk7 substrates using ion-assisted e-beam evaporation method, respectively. Renishaw inVia confocal laser Raman spectrometer was used to study the microstructure of all the samples. The measurement results show that the substrate’s thermal expansion coefficient has great influence on the microstructure of nano-silicon coatings. Owing to 300 degree deposition temperature, there will be thermal stress when the samples are cooled down, which leading to medium-range and short-range order of silicon molecular structure change. Accordingly, TA and TO2 mode will appear or disappear in Raman scattering spectra. Amorphous silicon coating can crystalize after laser irradiation with different Raman scattering TO peak offset for different substrates. Especially for nanosilicon coatings grown on reaction bonded SiC (RB-SiC) and Sintered SiC (S-SiC) under the same deposition conditions, they have different Raman scattering spectra and their thermal stress is different, which will give guidance to deposition and polishing process of nano-silicon layers.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"41 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":"125099616","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

Experimental investigation on dark solitons formation in Figure-9 Yb doped fiber laser 图9掺镱光纤激光器暗孤子形成的实验研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603121

Xinyi Li, Zexin Zhang, P. Duan, J. Tian, Yanrong Song

引用次数: 0