Sixteenth National Conference on Laser Technology and Optoelectronics最新文献_第5页

Effect of polarization parameters on electron motion and radiation characteristics under intense laser field 强激光场下极化参数对电子运动和辐射特性的影响

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600868

Jianping Chang, P. Yu, Yichen She, Jingjing Yan, Youwei Tian

{"title":"Effect of polarization parameters on electron motion and radiation characteristics under intense laser field","authors":"Jianping Chang, P. Yu, Yichen She, Jingjing Yan, Youwei Tian","doi":"10.1117/12.2600868","DOIUrl":"https://doi.org/10.1117/12.2600868","url":null,"abstract":"With Maxwell equation and Newton equation as a starting point, according to the present situation cannot be directly measuring the parameters of the ultrahigh laser, the theoretical derivation and numerical simulation method is deduced low-energy single electron acceleration model, and through MATLAB iteration, studied and analyzed the different polarization parameters of the laser pulse order electronic movement rule and the characteristics of space radiation. The results show that as the polarization parameterincreases from 0 to 1, the spatial distribution of electron energy radiation changes from linear plane to spiral shape, and the overall trend can be divided into four stages. The trajectory of the electron also changes from the plane oscillation to the spiral, and the radius of the spin gradually increases, and the decreasing speed of the radius after the peak also slows down. Based on the above research, the theoretical and numerical simulation basis is provided for the experimental study of high-energy electron radiation in full time, full space and the anti-detection of various parameters of laser.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"35 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":"121224428","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

Radiation characteristics of single and double peak pulses produced by a high energy electron head-on colliding with an intense laser pulse 高能电子与强激光脉冲正面碰撞产生的单峰和双峰脉冲的辐射特性

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2600888

Yu Chen, Hui Liu, Yu Cai, Youwei Tian

{"title":"Radiation characteristics of single and double peak pulses produced by a high energy electron head-on colliding with an intense laser pulse","authors":"Yu Chen, Hui Liu, Yu Cai, Youwei Tian","doi":"10.1117/12.2600888","DOIUrl":"https://doi.org/10.1117/12.2600888","url":null,"abstract":"According to Lorentz equation and electron motion equation, a collision model between a high-energy electron and an intense laser pulse is constructed, and the three-dimensional trajectory of electron motion and the pulse width, peak radiation power and frequency spectrum of radiation pulses under different observation angles and different laser pulse intensities are simulated by MATLAB software. The simulation results show that the motion of high-energy electron in the collision process is spiral for the intense laser pulse with initial phase φ 0 = 0 . When the observation angle Φ is 0° and 180°, the collision produces single zeptosecond pulse and double zeptosecond pulse, respectively. At Φ = 0, the peak radiation power of the radiation pulse is the largest, the pulse width is the smallest, and the spectrum presents two rising and falling shapes. At Φ= 180°, except that the spectrum shows the shape of first rising and then falling, other characteristics are opposite to those at Φ= 0°. The above characteristics of the laser pulse with ai = 80 are better than those of the laser pulse with ai = 50.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"113 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":"129383218","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

Giant and tunable Goos-Hänchen shifts with a surface plasmon resonance structure 巨大和可调谐Goos-Hänchen移位与表面等离子体共振结构

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602908

Liu Zihao, Liu Liujia, Zou Yujie, Zheng Zhiwei

引用次数: 0

Study on the process of laser marking for silicon wafer by 1060nm-MOPA laser 1060nm-MOPA激光打标硅片工艺研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603120

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

{"title":"Study on the process of laser marking for silicon wafer by 1060nm-MOPA laser","authors":"Tianjiao Shu, Lingling Zhang, Guo-quan Li, Yuanchao Du, Yuan Chen, Xuanjun Zhang, J. Zhang","doi":"10.1117/12.2603120","DOIUrl":"https://doi.org/10.1117/12.2603120","url":null,"abstract":"The silicon material is very sensitive to the change of the laser, and a small change in energy will cause a relatively large change in the morphology of the mark. Therefore, it is a great challenge to produce uniform and high-quality laser marks on silicon wafers. A new Master Oscillator Power-Amplifier (MOPA) fiber laser with independently adjustable pulse width and frequency have a wide adjustable parameter window. In this paper, a new type of MOPA fiber laser is used to study the marking process on silicon wafers. By changing average power (defined by the active current set point), pulse repetition frequency (PRF) and pulse duration of the laser (i.e., the number of pulses), dot matrix marking on the wafer, using the Keyence VHX-6000 optical microscope to determine the cleanliness and surface topography of the wafer surface to evaluate. Studies have shown that the influence of the output instability of the fiber laser on the marking quality can be reduced by increasing the number of pulses under the condition of stable and low power. At the same time, the resolution of the single pulse energy of the laser is improved by changing the laser PRF, and then the control precision of the energy is improved, so as to realize the high-quality silicon wafer laser marking process with uniform and stable marking morphology.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"24 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":"114912452","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

Study on the effect of picosecond laser cleaning on the performance of CFRTS-titanium alloy laser joint 皮秒激光清洗对cfrts -钛合金激光接头性能影响的研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602650

Q. Zou, Yiyun Ye, J. Jiao, Zifa Xu, Wentai Ouyang, Yufan Liu, Mina Zhang, Zhisheng Wu, Wenwu Zhang

{"title":"Study on the effect of picosecond laser cleaning on the performance of CFRTS-titanium alloy laser joint","authors":"Q. Zou, Yiyun Ye, J. Jiao, Zifa Xu, Wentai Ouyang, Yufan Liu, Mina Zhang, Zhisheng Wu, Wenwu Zhang","doi":"10.1117/12.2602650","DOIUrl":"https://doi.org/10.1117/12.2602650","url":null,"abstract":"Carbon Fiber Reinforced 1Plastic (CFRTS) and TC4 titanium alloy have excellent properties such as high stiffness, fatigue resistance and corrosion resistance, which are widely used in aerospace and new energy vehicle manufacturing. Due to the great differences in physical and chemical properties between CFRTS and TC4 titanium alloy, the traditional bonding and riveting methods have the problems of aging and stress concentration. This study introduces the interface composite control process of “picosecond laser cleaning and plastic-covered”. Firstly, CFRTS was subjected to laser cleaning pretreatment to remove the surface epoxy resin. Secondly, laser was used to pretreat the surface microstructure of TC4 titanium alloy. A layer of 0.02 mm PA powder was spread on the surface of the microstructure and melted by laser to form a plastic-covered layer. Finally, the treated CFRTS and TC4 titanium alloys were welded by laser-assisted joining. Compared with the traditional cleaning technology, it was found that the carbon fiber was exposed obviously and the structure was complete on the CFRTS surface after picosecond laser cleaning, and the epoxy resin was removed completely. The porosity of the joint interface is reduced, and the weld morphology is better. The shear strength of CFRTS-TC4 titanium alloy joint is significantly enhanced, and the maximum shear strength is 6333 N.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"60 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":"114649738","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

Study on laser coloring and color erasing-rewriting of TC4 surface TC4表面激光着色及擦除重写的研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603023

He Zhao, Zhaochen Cheng, Tong-mei Xia, Pu Wang

{"title":"Study on laser coloring and color erasing-rewriting of TC4 surface","authors":"He Zhao, Zhaochen Cheng, Tong-mei Xia, Pu Wang","doi":"10.1117/12.2603023","DOIUrl":"https://doi.org/10.1117/12.2603023","url":null,"abstract":"In this work, different colors with a large variation in total color difference (ΔE*) were induced by 1064 nm nanosecond pulsed laser on TC4 titanium alloy, which can expand and systematize the color gamut on TC4. The influences of laser parameters on the color difference were evaluated by hand-held colorimeter with CIEL*a*b* color space quantitatively and the morphology of oxide thin film was characterized. With the increasing of scanning speed, ΔE* increased from 22.8 to 95.72 and lightness difference (ΔL*) increased from 13 to 78. With the increasing of laser power, ΔL* decreased gradually. With the increasing of pulse repetition frequency, ΔE* increased from 15.07 to 98.42, and ΔL* increased from -9 to 74. Finally, the experiment of color erasing and repairing in controllable processing atmosphere was carried out as well. The ΔE* before and after laser erasing is less than 7 in low oxygen environment by introducing nitrogen atmosphere, and being exposed to liquids, which indicates that colors can be erased and repaired based on laser induced reduction. Rewriting in the erased fields can increase the saturation and lightness of colors. The possibility of erasing or rewriting colors in special treatment environment would take laser coloring to a new level, allowing not only improvement of color quality from reprocessed fields but also modification of marks during the laser processing according to the wishes of operators.","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":"126392373","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

Theoretical study on the self-healing property of cotangent phase modulated RAiGV 共切相位调制RAiGV自愈特性的理论研究

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602865

Y.-G. Kuang, Kaichen Pi, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan

引用次数: 0

Optical Magnus effect by transverse orbital momentum currents in reflection 反射中横向轨道动量流的光学马格努斯效应

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602909

Xiaoyan Yu, Jin Zhang, Yuqing Chen, X. Dai, Mian Huang

引用次数: 0

3D printing a Faraday anomalous dispersion optical filter housing 3D打印法拉第反常色散光学滤光片外壳

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2602015

Pengyuan Chang, Hangbo Shi, Jun Pan, Chunlai Li, G. Hu, Jin He, Jingbiao Chen

引用次数: 0

Novel four-step phase shifting algorithm based on the products of sines and cosines 一种基于正弦余弦乘积的四步相移算法

Sixteenth National Conference on Laser Technology and Optoelectronics Pub Date : 2021-08-31 DOI: 10.1117/12.2603038

Jinjun Lu, Xiangshan Kong, Jian Xu, Xiao G. Sun, Fu-Ping Wang

{"title":"Novel four-step phase shifting algorithm based on the products of sines and cosines","authors":"Jinjun Lu, Xiangshan Kong, Jian Xu, Xiao G. Sun, Fu-Ping Wang","doi":"10.1117/12.2603038","DOIUrl":"https://doi.org/10.1117/12.2603038","url":null,"abstract":"Wrapped phase extraction is an essential process for the retrieval of absolute phase and even the computation of object height information in fringe projection profilometry. Over the past few decades, tremendous efforts have been devoted to developing various techniques for computing wrapped phase. By comparison, four-step phase-shifting techniques play an important vehicle for obtaining the wrapped phase of 3D objects. At present, a variety of four-step phase-shifting algorithms show the comprehensive mathematical deduction and their theories are very clear. Analysis from the perspective of theoretical integrity, however, the phase-shifting techniques lack the exploration of arbitrary phase shift. In view of this, inspired by the prosthaphaeresis in trigonometric, we present a novel four-step phase-shifting algorithm. The proposed method includes 16 kinds of four-step phase-shifting fringe combination and corresponding calculation formula of wrapped phase, which are deduced with two frames fringe images of sines and two ones of cosines. Furthermore, simulations and experiments have been carried out to reveal the influence law of variable phase shift on the performance of these approaches.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"555 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114049436","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