Quantum and Thermal Interaction between Substances and Combined Laser Beams with Different Wavelength

物质与不同波长组合激光束之间的量子和热相互作用

基本信息

  • 批准号:
    10305055
  • 负责人:
  • 金额:
    $ 25.11万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
  • 财政年份:
    1998
  • 资助国家:
    日本
  • 起止时间:
    1998 至 2001
  • 项目状态:
    已结题

项目摘要

The outline of results obtained in the research period from 1998 to 2001are summarized below.1) Effect of wavelength of laser on ablation processing characteristicsAblation hole drilling pheaoniena were materials. Laser wavelength used were the second high harmonic (λ=532 nm), third high harmonic (λ=355 nm) and fourth high harmonic (λ=266 nm) of Q-switched YAG laser. In the hole drilling of acrylic plate by the second and third high hamonics, there appeared heat affected zone around the hole in spite of nono-secorid pulse and cracking was generated after multiple laser irradiation. However, by the fourth high harmonics, the heat affected zone was hardly seen and the process became the quantum mode. Also, light emission behavior from plasma was studied and it was revealed that the interaction between incident beam and plasma gave significant effect of ablation process.2) Effect of combined laser beams with different wavelength on melting characteristics of various metalsThe combined las … More er beams with different wavelength, i.e., basic wavelength of YAG laser (l=1064 nm) and second high harmonics (SHG) of Q-switched YAG laser (l=532 nm) was irradiated on the various metals. It was revealed that the high reflective metals such as pure copper and aluminum could not melt by basic wave of YAG laser with peak power of 5 kW. However, the addition of small power SHG YAG laser (40 W) enhanced the melting efficiency greatly up to 130 percent. The similar effect was confirmed in other metals. In the lap welding of very thin sheet less than 0.1 mm in thickness, the basic wavelength YAG laser can not weld, but it was successfully welded when the combined laser beams were used.3) Direct observation of keyhole dynamics in laser weldingKeyhole behaviors in CW and pulsed laser welding were observed by X-ray transmission imaging system with high temporal resolution. In CW laser welding, the keyhole fluctuated quickly and this instability caused the porosity formation. While, in pulsed laser spot welding, a keyhole was quickly collapsed and metal vapor as well as shielding gas were confined in the keyhole when laser power was quickly terminated which led the formation of large porosity. The most effective way to suppress the porosity formation was the use of controlled pulse wave. Less
1998年至2001年的研究结果概述如下:1)激光波长对烧蚀加工特性的影响烧蚀孔钻削材料。所用激光波长为调Q YAG激光的二次谐波(λ=532 nm)、三次谐波(λ=355 nm)和四次谐波(λ=266 nm)。用二、三高谐波激光对丙烯酸树脂板进行打孔时,尽管有非正弦脉冲,孔周围仍出现热影响区,多次激光照射后产生裂纹。然而,通过第四高次谐波,几乎看不到热影响区,并且该过程变为量子模式。研究了等离子体的发光行为,发现入射光束与等离子体之间的相互作用对烧蚀过程有显着影响。2)不同波长的组合激光束对各种金属熔化特性的影响组合激光束 ...更多信息 具有不同波长的Er光束,即,用YAG激光的基波长(l= 1064nm)和调Q YAG激光的二次谐波(l= 532nm)辐照各种金属。结果表明,峰值功率为5kW的YAG激光器的基波不能熔化纯铜、铝等高反射金属。然而,小功率SHG YAG激光器(40 W)的加入大大提高了熔化效率高达130%。在其他金属中也证实了类似的效果。在厚度小于0.1mm的薄板搭接焊中,基波长YAG激光不能焊接,但当使用组合激光束时,可以成功地焊接。3)激光焊接中小孔动态的直接观察利用高时间分辨率的X射线透射成像系统,观察了连续和脉冲激光焊接中的小孔行为。在连续激光焊接中,小孔的波动很快,这种不稳定性导致气孔的形成。而脉冲激光点焊中,当激光功率快速终止时,小孔迅速塌陷,金属蒸气和保护气体被限制在小孔中,导致大气孔的形成。抑制孔隙形成的最有效方法是使用可控脉冲波。少

项目成果

期刊论文数量(11)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
S.Katayama, Y.Kobayashi, M.Mizutani, A.Matsunawa: ""Effect of Vacuum on Penetration and Defects in Laser Welding""Journal of Laser Applications. Vol.13,No.5. 187-192 (2001)
S.Katayama、Y.Kobayashi、M.Mizutani、A.Matsunawa:“真空对激光焊接熔深和缺陷的影响”《激光应用杂志》。
  • DOI:
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    0
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瀬渡直樹, 片山聖二, 松縄 朗: "「アルミニウム合金レーザ溶接時のポロシティ生成機構の解明とその抑制法」"溶接学会論文集. vol.18,No.2. 243-255 (2000)
Naoki Seto、Seiji Katayama、Akira Matsunawa:“铝合金激光焊接过程中气孔产生机制及其抑制方法的阐明”日本焊接学会论文集第 18 卷,第 243-255 期(2000 年)。
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    0
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MATSUNAWA Akira其他文献

MATSUNAWA Akira的其他文献

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{{ truncateString('MATSUNAWA Akira', 18)}}的其他基金

Studies on Optimization of Laser Materials Processing by Pulse Shaping
脉冲整形优化激光材料加工的研究
  • 批准号:
    03555160
  • 财政年份:
    1991
  • 资助金额:
    $ 25.11万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Beam-Material Interactions and Dynamic Processing Characteristics in Laser Micro-thermal Materials Processing
激光微热材料加工中的光束-材料相互作用和动态加工特性
  • 批准号:
    61460209
  • 财政年份:
    1986
  • 资助金额:
    $ 25.11万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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Soft opt mechanical systems operated by different wavelength near-infrared light
由不同波长近红外光操作的软光学机械系统
  • 批准号:
    21H01239
  • 财政年份:
    2021
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Regeneration of color vision in blind rats using channelrhodopsin genes having different wavelength properties
使用具有不同波长特性的视紫红质通道基因使失明大鼠色觉再生
  • 批准号:
    16H05485
  • 财政年份:
    2016
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Conversion of Carbon Dioxide into Fuel by Photocatalyst Reactor Utilizing Light Having Different Wavelength for Reaction and Mass Transfer Promotion
光触媒反应器利用不同波长的光进行反应并促进传质将二氧化碳转化为燃料
  • 批准号:
    16K06970
  • 财政年份:
    2016
  • 资助金额:
    $ 25.11万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Research for the three-dimensional processing using the two-lasers with different wavelength
不同波长两激光三维加工研究
  • 批准号:
    21710108
  • 财政年份:
    2009
  • 资助金额:
    $ 25.11万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Reduction of volumetricshrinkage by means of irradiation with different wavelength light
通过不同波长光的照射减少体积收缩
  • 批准号:
    19791412
  • 财政年份:
    2007
  • 资助金额:
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  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Incorporation of Three Infra-red Rays Transfer on the Different Wavelength into Learning and Instructional System for Foreign Language Education
将三种不同波长的红外线传输纳入外语教育学习和教学系统
  • 批准号:
    14380094
  • 财政年份:
    2002
  • 资助金额:
    $ 25.11万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
LIGHTING CONDITION WITH DIFFERENT WAVELENGTH FOR ANTHOCYIANIN SYNTHESIS OF GRAPE BERRIES
不同波长光照条件下葡萄浆果花青素的合成
  • 批准号:
    09660030
  • 财政年份:
    1997
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  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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