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Thermal losses in the process of gas-assisted laser cutting of metals 气体辅助激光切割金属过程中的热损耗
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464114
I. O. Bazyleva, M. G. Galushkin, V. Golubev, E. A. Dubrovina, V. Karasev
{"title":"Thermal losses in the process of gas-assisted laser cutting of metals","authors":"I. O. Bazyleva, M. G. Galushkin, V. Golubev, E. A. Dubrovina, V. Karasev","doi":"10.1117/12.464114","DOIUrl":"https://doi.org/10.1117/12.464114","url":null,"abstract":"Gas assisted laser cutting (GALC) is accompanied by formation of heat affected zone (HAZ). A part of laser beam power is spent on this. Thermal losses cannot only decrease GALC efficiency, but cause thermal deformations of the treated material. The temperature measurement of samples heating under GALC were performed. The dependence of the samples temperature on cutting velocity was obtained under blowing by nitrogen and oxygen. In the first case dross was formed, the contribution of its crystallization enthalpy into plate heating was taken into account in estimations of GALC energy balance. As a result, the limiting physical value of heat losses was obtained, and its dependence on velocity was plotted. It has been revealed that a portion of thermal losses at low cutting velocities was essential. A qualitative physical model was suggested which gave a satisfactory description of the obtained experimental results. The GALC conditions for minimum thermal losses were defined.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114818137","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
Self-Q-switching at phase conjugation in active media 有源介质中相位共轭的自q开关
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464154
A. Fedin, S. A. Kyalbieva, A. Gavrilov, S. Smetanin
{"title":"Self-Q-switching at phase conjugation in active media","authors":"A. Fedin, S. A. Kyalbieva, A. Gavrilov, S. Smetanin","doi":"10.1117/12.464154","DOIUrl":"https://doi.org/10.1117/12.464154","url":null,"abstract":"Self-Q-switching of the Nd:crystal (Nd:YAG, Nd:GGG) and the Nd:glass multiloop lasers (phosphorus GLS-22) with self- pumped phase conjugation (SPC) in active media is investigated experimentally and theoretically. A possibility to realize single-mode single-frequent self-Q-switched laser radiation as repetitive giant pulse trains of 50 W average and 100 kW peak power with no Q-switcher is shown. Temporal dynamics of self-Q-switching and the mechanism of its occurrence on gain gratings are investigated with a help of the rate equations.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115924425","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: 10
Adaptive liquid-crystal lens with optically addressed focal length 具有光学寻址焦距的自适应液晶透镜
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464168
I. Guralnik
{"title":"Adaptive liquid-crystal lens with optically addressed focal length","authors":"I. Guralnik","doi":"10.1117/12.464168","DOIUrl":"https://doi.org/10.1117/12.464168","url":null,"abstract":"A novel design for optically addressed modal liquid-crystal adaptive lens is presented. Described is the implementation of the 2-layer lens, a simplified model explaining its performance, and first experimental results on wave front shaping and focusing by the optically addressed lens.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124891000","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
Numerical studies of the fundamental and first-overtone transitions CO laser gain excited in slab rf discharge 平板射频放电中CO激光增益的基频跃迁和第一泛音跃迁的数值研究
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464157
W. N. Baldwin, G. Hager, A. Ionin, I. Kochetov, Y. Konev, J. McIver, A. Napartovich
{"title":"Numerical studies of the fundamental and first-overtone transitions CO laser gain excited in slab rf discharge","authors":"W. N. Baldwin, G. Hager, A. Ionin, I. Kochetov, Y. Konev, J. McIver, A. Napartovich","doi":"10.1117/12.464157","DOIUrl":"https://doi.org/10.1117/12.464157","url":null,"abstract":"Numerical code for simulating the vibrational distribution function in an RF excited slab CO laser with diffusion cooling is developed. Spatial distributions of the small signal gain on the fundamental and first overtone for different vibration-rotation transitions were obtained. Dependence of gain on the wall temperature, input power and gas mixtures was studied.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123515078","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
Theoretical and experimental investigation of aerodynamic window for high-power laser 大功率激光器气动窗口的理论与实验研究
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464160
Wenfeng Yu, Zu-hai Cheng, Shao-lou Hu, Yang Zhang, Yufeng Peng, Feng Li
{"title":"Theoretical and experimental investigation of aerodynamic window for high-power laser","authors":"Wenfeng Yu, Zu-hai Cheng, Shao-lou Hu, Yang Zhang, Yufeng Peng, Feng Li","doi":"10.1117/12.464160","DOIUrl":"https://doi.org/10.1117/12.464160","url":null,"abstract":"A new type of aerodynamic window structure using jet- injection is developed. The theoretical analysis and experimental research are presented as well. Results showed that while the lowest sealing pressure is 5.0 Torr and gas consumption is 35 g/s, the ratio of the Strehl reaches 0.98. The new aerodynamic window is demonstrated satisfactorily in the experiment connected to high-power laser.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121613285","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
Ultrashort laser pulse ablation and spatial distribution of ablation products of NiMoRe target 超短激光脉冲烧蚀及其烧蚀产物的空间分布
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464134
T. V. Vlasov, R. Volkov, V. Gordienko, M. S. Dzhidzhoev, V. Kulikauskas, A. Savel’ev, V. Chernysh
{"title":"Ultrashort laser pulse ablation and spatial distribution of ablation products of NiMoRe target","authors":"T. V. Vlasov, R. Volkov, V. Gordienko, M. S. Dzhidzhoev, V. Kulikauskas, A. Savel’ev, V. Chernysh","doi":"10.1117/12.464134","DOIUrl":"https://doi.org/10.1117/12.464134","url":null,"abstract":"In this work we present the results of experimental investigations of laser ablation initiated by 200 fs and 30 ps laser pulses with the energy fluence of ~0.2 J/cm2. It was shown that in the case of picosecond pulses the ablation depth is governed by the thermal conductivity whereas in the case of femtosecond pulses the skin-layer depth is the major parameter. We also obtained that the duration and the energy fluence of laser pulse strongly affects spatial distribution of stoichiometric composition of sputtered material.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121881237","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
Five-year experience of industrial operation of the first domestic LOM-based system Karat-200 5年国内首个基于lom的系统Karat-200的工业运行经验
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464181
A. Yakovlev, V. Veiko, Y. G. Yahontov, E. Yakovlev
{"title":"Five-year experience of industrial operation of the first domestic LOM-based system Karat-200","authors":"A. Yakovlev, V. Veiko, Y. G. Yahontov, E. Yakovlev","doi":"10.1117/12.464181","DOIUrl":"https://doi.org/10.1117/12.464181","url":null,"abstract":"The paper presents the history of development and technological adjustment of the first Russian system for manufacturing 3D models using LOM algorithm; the experience of this system application is considered and analyzed. The principles of its arrangement, peculiarities of design and distinctions from LOM systems of Helisys type are considered. The main characteristics of the system - efficiency, operation stability, accuracy of model production, physical and mechanical properties of produced models - are investigated. Main kinds of waste and causes for its occurrence are analyzed, and ways of their elimination are found. Relying upon the experience of this system application a technical assignment has been elaborated for production of Karat-400, a LOM system of the next generation.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125214300","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
Extending the boundaries of reverse engineering 扩展逆向工程的边界
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464175
Christophe J. C. Lawrie
{"title":"Extending the boundaries of reverse engineering","authors":"Christophe J. C. Lawrie","doi":"10.1117/12.464175","DOIUrl":"https://doi.org/10.1117/12.464175","url":null,"abstract":"In today's market place the potential of Reverse Engineering as a time compression tool is commonly lost under its traditional definition. The term Reverse Engineering was coined way back at the advent of CMM machines and 3D CAD systems to describe the process of fitting surfaces to captured point data. Since these early beginnings, downstream hardware scanning and digitising systems have evolved in parallel with an upstream demand, greatly increasing the potential of a point cloud data set within engineering design and manufacturing processes. The paper will discuss the issues surrounding Reverse Engineering at the turn of the millennium.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"4644 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129808634","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
Enhanced spectral broadening and spectral distortions of short laser pulses in holey fibers 短激光脉冲在多孔光纤中的增强光谱展宽和光谱畸变
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464182
A. Fedotov, A. Tarasevitch, S. Bagayev, D. von der Linde, V. Pivtsov, A. Zheltikov
{"title":"Enhanced spectral broadening and spectral distortions of short laser pulses in holey fibers","authors":"A. Fedotov, A. Tarasevitch, S. Bagayev, D. von der Linde, V. Pivtsov, A. Zheltikov","doi":"10.1117/12.464182","DOIUrl":"https://doi.org/10.1117/12.464182","url":null,"abstract":"The influence of the structure of the holey-fiber cladding on the spectral broadening of femtosecond laser pulses is experimentally studied. These experiments demonstrate that the spectral broadening of 70-fs pulses of 800 nm Ti:sapphire laser radiation transmitted through 2- and 3- micrometers -pitch holey fibers can be enhanced by a factor of about 1.5 by increasing the air-filling fraction of the fiber cladding from 16 up to 65%. The main physical factors influencing the phase distribution and coherence properties of broadly spanning frequency combs produced with the use of holey fibers are considered. Phase shifts and spectral distortions arising due to dispersion effects, modulation instabilities, and shock waves of pulse envelopes are explored, and general recipes to reduce the influence of these effects by means of fiber optics are discussed.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129326189","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
Perspective Nd:GGG laser with phase conjugation in active medium 有源介质中相位共轭Nd:GGG激光器
International Conference on Laser and Laser Information Technologies Pub Date : 2002-04-30 DOI: 10.1117/12.464150
A. Fedin, T. Basiev, A. Rulev, Ye. A. Chaschin
{"title":"Perspective Nd:GGG laser with phase conjugation in active medium","authors":"A. Fedin, T. Basiev, A. Rulev, Ye. A. Chaschin","doi":"10.1117/12.464150","DOIUrl":"https://doi.org/10.1117/12.464150","url":null,"abstract":"An opportunity to compensate phase and polarizing distortions of the laser radiation directly in Nd:GGG active medium and also in phototropic LiF:F2- crystal is investigated. We found that an application of modified Sagnac interferometer with passive LiF:F2- Q- switcher, located inside it, allows not only to increase stability and power of laser pulses, but also to narrow the laser oscillation spectrum. The possibility is demonstrated of generating single-mode radiation with an energy in a train of laser pulses higher than 7 J, a peak power of a single pulse in a train up to 50 kW, the spatial brightness exceeding 5 x 1010 W/cm2 x sr, and the coherence length in excess of 13 m.","PeriodicalId":194489,"journal":{"name":"International Conference on Laser and Laser Information Technologies","volume":" 30","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120933547","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
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