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yag laser welding with surface activating flux

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China Welding 2003年第2期12卷 83-86页

作者：樊丁张瑞华田中学中田一博牛尾诚夫 The State Key Laboratory of New Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 Joining and Welding Research Institute Osaka University Osaka Japan

yag laser welding with surface activating flux has been investigated, and the influencing factors and mechanism are discussed. The results show that both surface activating flux and surface active element S have fantastic effects on the yag laser weld shape, that is to obviously increase the weld penetration and D/W ratio in various welding conditions. The mechanism is thought to be the change of weld pool surface tension temperature coefficient, thus, the change of fluid flow pattern in weld pool due to the flux.

关键词： yag laser laser welding surface activating flux weld shape weld penetration

High peak power laser-diode-pumped passively Q=switched Nd:YVO_4/Cr^(4+):yag laser

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Chinese Optics Letters 2004年第10期2卷 590-591页

作者：李健王翠玲王衍子危芹付殿岭林学春姚爱云崔大复许祖彦 Modern Optical Laboratory Department of Physics Shandong Normal University Ji'nan 250014 Institute of Physics Chinese Academy of Science Beijing 100080 Institute of Physics Chinese Academy of Science Beijing 100080n this paper we report a high peak power passively Q-switched laser-diode-end-pumped Nd:YVO_4/Cr~(4+):YAG laser polarized along the C axis generating 4.23-W average power and 18-kW peak power (144-μJ pulse power) with 8.0-ns time duration (29.4-kHz repetition rate) at 1064 nm while the pump power is 21.2 W.

In this paper, we report a high peak power passively Q-switched laser-diode-end-pumped Nd:YVO_4/Cr^(4+):yag laser polarized along the C axis, generating 4.23-W average power and 18-kW peak power (144-μJ pulse power) ... 详细信息

关键词： yag laser High peak power laser-diode-pumped passively Q=switched Nd high Nd High peak power laser-diode-pumped passively Q

TREATMENT OF LUNG CANCER AT LATE STAGE BY HOLMIUM: yag laser-A CLINICAL SURVEY OF 4 CASES

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Medical Bulletin of Shanghai Jiaotong University 1999年第2期20卷 129-130页

作者：张美珏朱菁张慧国王复娟柯玲马伟罗群华张月娥

Objective In order to investigate the effect and leasibility of Holmium: yag laser in the treatment of lung cancer at late stage. Methods 4 cases of lung cancer at late stage were treated with Holmium: yag laser through liber brochoscopie. ResuIts The patients received the palliative treatment for 3~7 times. Alter the treatment, the tumor tissues decreased in size, and the tracts were unobstructed. The symptoms due to tract- obstruction were improved. Conclusion Holmium: yag laser treatment has some practical value by improving the tract obstruction of lung cancer at late stage, improving the lung function and also the lofe quality.

关键词： Holmium yag laser lung cancer

Simulation of Patterns and Qualitative Analysis of Pattern Rotation in an End-Pumped Nd：YVO4 laser

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Chinese Physics Letters 2006年第11期23卷 2982-2984页

作者：韩克祯潘淑娣范秀伟黄海涛何京良 College of Physics and Electronics Shandong Normal University Ji'nan 250014 School of Physics Shandong University of Technology Zibo 255049

We simulate some laser output patterns observed in our previous experiment employing superposition of Laguerre- Gaussian modes. The rotating pattern is qualitatively analysed from the point of contemporary spatial bur... 详细信息

关键词： TRANSVERSE-MODE COMPETITION SEMICONDUCTOR-laserS GAUSSIAN MODES yag laser CAVITY CO2-laser

Compact Diode-Pumped Continuous-Wave Nd：LuVO4 lasers Operated at 916 nm and 458 nm

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Chinese Physics Letters 2006年第5期23卷 1192-1194页

作者：张玲张春雨魏志义张驰龙拥兵张治国张怀金王继扬 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100080 National Laboratory of Crystal Materials and Institute of Crystal Materials Shandong University Jinan 250100

We report the compact diode-pumped continuous-wave （CW） Nd：LuV04 lasers operated at 916nm and 458nm for the first time. The maximum output power of 780mW at 916nm laser is obtained with a slope efficiency of 9.3%. ... 详细信息

关键词： FREQUENCY-DOUBLED ND OUTPUT POWER yag laser PERFORMANCE EFFICIENT CRYSTAL

Accurate laser skin perforation technique aimed at promoting bleeding and reducing pain

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Journal of Innovative Optical Health Sciences 2015年第6期8卷 9-16页

作者： Han-Chao Chang Yu-Hsuan Lin Kuo-Cheng Huang Instrument Technology Research Center National Applied Research Laboratories Hsinchu 30076Taiwan

laser skin perforation is an effective and promising technique for use in blood *** this study,the relation between the perforation profile of skin and laser irradiation at various energies is *** laser energy does not uniformly expand the size and depth of a hole because the shallow depth of field(DOF)of the focused light primarily concentrates energy on the skin *** practice,the hole gradually transforms from a semielliptical shape to an upsidedown avocado shape as the laser energy *** phenomenon can increase the amount of bleeding and reduce *** findings support the feasibility of developing an accurate laser skin perforation method.

关键词： laser skin perforation blood collection Er yag laser diabetic

Self-Starting Passively Mode-Locking All-Solid-State laser with GaAs Absorber Grown at Low Temperature

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Chinese Physics Letters 2005年第10期22卷 2575-2577页

作者：贾玉磊令维军魏志义王勇刚马骁宇 Laboratory of Optical Physics Institute of Physics. Chinese Academy of Sciences Beijing 100080 Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

We realize a stable self-starting passively mode-locking all-solid-state laser by using novel GaAs mirrors as the absorber and output coupler. The GaAs mirror is grown by the technology of metal organic chemical vapour deposition at low temperature. With such an absorber as the output coupler in the laser resonator, laser pulses with duration of 42ps were generated at a repetition rate of 400MHz, corresponding to the average power of 590mW.

关键词： SEMICONDUCTOR SATURABLE ABSORBERS ND-YLF laserS ND-GDVO4 laser yag laser MIRROR ND-YVO4

Effect of laser characteristics on the weld shape and properties of penetration laser weld of BT20 titanium alloy

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China Welding 2004年第1期13卷 1-6页

作者：陈俐巩水利姚伟胡伦骥 Department of Materials Science and Engineering Huazhong University of Science and Technology National Key Laboratory of High Density Beam Processing Technology Beijing Aeronautical Manufacturing Technology Research Institute

The laser beam welding of BT20 titanium alloy was conducted to investigate the weld shape, microstructures and properties. The full penetration weld characteristics produced by CO_2 laser and by yag laser were compared. The results show that the full penetration weld of yag laser welding closes to “X” shape, and weld of CO_2 laser welding is “nail-head” shape. Those result from special heating mode of laser deep penetration welding. The tension strength of CO_2 laser and yag laser joints equal to that of the base metal, but the former has better ductility. All welds consist mainly of the acicular α phase and a few β phase in microstructure. The dendritic crystal of CO_2 laser weld is a little finer than yag laser weld. According the research CO_2 laser is better than yag laser for welding of BT20 titanium alloy.

关键词： titanium alloy laser welding CO_2 laser yag laser weld shape microstructures mechanical properties

A New Method of Hardening Inner Wall of Long Pipe

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High Technology Letters 2001年第2期7卷 80-82页

作者：王扬 Deng Zhongquan Qu Cunjing Department of Mechanical Engineering Harbin Institute of Technology

A new laser inner wall hardening method for long pipe mas introduced. The system combines laser surface hardening with robot moving in pipeline. Some craft experiments have been done with this system and optimum param... 详细信息

关键词： laser hardening Long pipe yag laser