• 제목/요약/키워드: Laser

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Laser Processing Technology in Semiconductor and Display Industry (반도체 및 디스플레이 산업에서의 레이저 가공 기술)

  • Cho, Kwang-Woo;Park, Hong-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.6
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    • pp.32-38
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    • 2010
  • Laser material processing technology is adopted in several industry as alternative process which could overcome weakness and problems of present adopted process, especially semiconductor and display industry. In semiconductor industry, laser photo lithography is doing at front-end level, and cutting, drilling, and marking technology for both wafer and EMC mold package is adopted. Laser cleaning and de-flashing are new rising technology. There are 3 kinds of main display industry which use laser technology - TFT LCD, AMOLED, Touch screen. Laser glass cutting, laser marking, laser direct patterning, laser annealing, laser repairing, laser frit sealing are major application in display industry.

Study on Robot based Remote Laser Welding (로봇 기반 원격 레이저 용접에 관한 연구)

  • Kang, Hee-Shin;Suh, Jeong;Cho, Taik-Dong
    • Laser Solutions
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    • v.11 no.4
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    • pp.21-28
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    • 2008
  • Remote Laser welding technology for manufacturing automotive body is studied. Laser welding and industrial robot systems are used for the robot based laser welding system. The laser system is used 1.6kW Fiber laser(YLR-1600) of IPG. The robot system is used HX130-02 of Hyundai Heavy Industry(payload : 130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The welding joints of steel plate and steel plate coated with zinc are butt and lapped joints. The quality test of the laser welding are through the observation the shape of bead on plate and cross-section of welding part. During past three years the laser system, 4kW Nd:YAG laser (HL4006D) of Trumpf was used and the robot system, IRB6400R of ABB (payload:120kg) was used. The new laser source, robot and laser scanner system are used to increase the processing speed and to improve the process efficiency. This paper introduces the robot based remote laser welding system to resolve the limited welding speed and accuracy of the conventional laser welding system.

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An Analysis of the Correlation between He-Ne Laser Therapy in Literature and Clinical Application (He-Ne 레이저에 대한 문헌과 이를 근거로 한 임상 활용 예의 비교 고찰)

  • Youn, In-Hwan;Kim, Nam-Kwen
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.19 no.2
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    • pp.192-201
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    • 2006
  • Objectives : Recently, He-Ne laser has been used for clinical purpose. We study the medical basis of He-Ne laser therapy and We make a proposal concerning the clinical application of using He-Ne laser in Medicine. Methods : We have selected data related to He-Ne laser therapy and study how to use He-Ne laser in clinic. Results : In biology, He-Ne laser therapy has been effects of an improve in skin regeneration an improve in peripheral and central nerve regeneration an improve in muscle regeneration, an anti-inflammation an alleviation of pain and a bone repair. In oriental medicine, He-Ne laser has been used to laser acupuncture and laser oriental physical treatment. In clinic, He-Ne laser have been used to care several parts like as facial palsy, facial spasm, trigeminal neuropathy, rhinitis and tinnitus. Recently, there is argument that He-Ne laser therapy is suitable to medical insurance. Conclusions : Laser therapy in oriental medicine is widespread and We can apply He-Ne laser to facial palsy, facial spasm, trigeminal neuropathy, rhinitis, tinnitus by using laser acupuncture or laser oriental physical treatment. Till now the whole mechanisms are not fully understood, so we hope to study these mechanisms actively and make suitable to medical insurance device in the near future.

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Laser Micro Soldering and Soldering Factors (레이저 마이크로 솔더링과 솔더링 인자)

  • Hwang, Seung Jun;Hwang, Sung Vin;Jung, Jae Pil
    • Journal of the Microelectronics and Packaging Society
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    • v.27 no.3
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    • pp.1-8
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    • 2020
  • In this paper, the principles, characteristics and recent studies of the laser micro soldering are reviewed. The factors which influence laser micro welding and soldering are also included. Laser soldering is a non-contact process that transfers energy to solder joint by a precisely controlled laser beam. In recent electronics industry, the demands for laser soldering are increasing due to bonding for complex circuits and local heating in micro-joint. In laser soldering, there are several important factors like laser absorption, laser power, laser scanning speed, and etc, which affect laser solderability. The laser absorption ratio depends on materials, and each material has different absorption or reflectivity for the laser beam, which requires fine adjustment of the laser beam. Laser types and operating conditions are also important factors for laser soldering performance, and these are also reviewed.

The Spectrum of Laser Instruments for Laser Acupuncture Application (레이저침 시술에 사용되는 레이저 기기의 적용 범위에 대한 고찰)

  • Hwang, Eui-Hyoung;Yang, Chang-Sop;Jang, In-Soo
    • Journal of Acupuncture Research
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    • v.26 no.1
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    • pp.49-57
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    • 2009
  • Objectives : During the past three decades there has been a significant evolution of laser acupuncture application in the nature of the clinical approach and the research of traditional medicine and laser therapy field. However, there have been no standard and guideline of laser equipment can be applied as laser acupuncture. This study aims to investigate the condition of laser equipment required as a laser acupuncture method. Methods : First, we performed literature search using the Medline(from 1999 to Oct 2008) to confirm types and ranges of laser equipments that can be applied as laser acupuncture. In addition, we investigated the characters of acupoints such as sites and depths, and compared with penetrating depths of each laser. Results : A total of 37 articles for clinical studies using laser acupuncture were selected, and 41 lasers were used. GaAs laser was used three times, GaAlAs laser 14, InGaAlP 18, HeNe laser 4, and Argon laser and CO2 laser were used one time, respectively. From all 361 points of fourteen meridians, depths of 341 points(94.5%) were 1 cun(2.3-3.2cm) or less. The mean depth of all points was 0.48 cun(1.1-1.5cm). Hence, it appeared that the majority of therapeutic lasers satisfied with the condition. HeNe, InGaAlP, GaAlAs, GaAs lasers are recommended for laser acupuncture, however, it may plausible that other surgical lasers could be used as the laser acupuncture, because it have the biostimulation effect to some extent, too. Conclusions : It is suggested that to select appropriate laser type and give the adequate output power to reach the acupoints under the skin using laser acupuncture. Further evaluation and research for the condition of laser acupuncture are warranted.

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Fiber Laser Welding in the Car Body Shop - Laser Seam Stepper versus Remote Laser Welding -

  • Kessler, Berthold
    • Journal of Welding and Joining
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    • v.31 no.4
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    • pp.17-22
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    • 2013
  • The excellent beam quality of high power fiber lasers are commonly used for remote welding applications in body job applications. The Welding speed and productivity is unmatched with any other welding technology including resistance spot welding or traditional laser welding. High tooling cost for clamping and bulky safety enclosures are obstacles which are limiting the use. With the newly developed Laser stitch welding gun we have an integrated clamping in the process tool and the laser welding is shielded in a way that no external enclosure is needed. Operation of this laser welding gun is comparable with resistance spot welding but 2-times faster. Laser stitch welding is faster than spot welding and slower than remote welding. It is a laser welding tool with all the laser benefits like welding of short flanges, weld ability of Ultra High Strength steel, 3 layers welding and Aluminium welding. Together with low energy consumption and minimum operation cost of IPG fiber laser it is a new and sharp tool for economic car body assembly.

Study on Path Generation for Laser Welding Robot (레이저 용접 로봇의 경로 생성에 관한 연구)

  • Kang, Hee-Shin;Suh, Jeong;Park, Kyoung-Taik
    • Laser Solutions
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    • v.13 no.4
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    • pp.14-20
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    • 2010
  • Robot path generation and laser welding technology for manufacturing automotive body are studied. Laser welding and industrial robot systems are used with the robot based laser welding system. The laser system used in this study is 1.6kW Fiber laser, while the robot system is 6 axes Industrial robot (payload: 130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The laser source, robot and laser scanner system are used to increase the processing speed and to improve the process efficiency. The welding joints of steel plate are butt and lapped joints. The quality test of the laser welding are through the observation the shape of bead on plate and cross-section of welding part. The 3 dimensional laser welding for non-linear pipe welding line is performed. This paper introduces the robot based laser welding system to resolve the limited welding speed and accuracy of the conventional spot welding system.

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Interaction of Laser Beam with PZT - Target and Observation of Laser - Induced Plume and Particle Ejection (Laser와 PZT - Target간의 반응과 그에 따른 Plume 형성 및 입자 방출에 관한 연구)

  • Lee, Byeong-U
    • Journal of Advanced Marine Engineering and Technology
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    • v.20 no.5
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    • pp.93-102
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    • 1996
  • Laser-induced plume and laser-target interaction during pulsed laser deposition are demonstrated for a lead zirconate titanate (PZT). A KrF excimer laser (wavelength 248nm) was used and the laser was pulsed at 20Hz, with nominal pulse width of 20ns. The laser fluence was~$16J/cm^2,$ with 100mJ per pulse. The laser-induced plasma plume for nanosecond laser irradiation on PZT target has been investigated by optical emission spectra using an optical multichannel analyzer(OMA) and by direct observation of the plume using an ICCD high speed photography. OMA analysis showed two distinct ionic species with different expansion velocities of fast or slow according to their ionization states. The ion velocity of the front surface of the developing plume was about $10^7$cm/sec and corresponding kinetic energy was about 100eV. ICCD photograph showed another kind of even slower moving particles ejected from the target. These particles considered expelled molten parts of the target. SEM morphologies of the laser irradiated targets showed drastic melting and material removal by the laser pulse, and also showed the evidence of the molten particle ejection. The physics of the plasma(plume) formation and particle ejection has been discussed.

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Fabrication of waveguide using UV Ar-ion laser direct writing (Laser Direct Writing 방법을 이용한 광도파로 제작)

  • Kang H. S.;Suh J.;Lee J. H.;Kim J. O.
    • Laser Solutions
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    • v.8 no.1
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    • pp.9-18
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    • 2005
  • The laser direct writing method using a UV Argon-ion laser is studied for fabrication of waveguide. The laser direct writing system is constructed with a vision camera, a xy-stage, a motion controller and the delivery components of a laser beam. The UV Argon-ion laser has wavelength range of $333.6\~363.8$ nm. A photo-active UV curable polymer for a planar light-wave circuit(PLC) of single mode is used. This polymer is irradiated by Argon-ion laser and developed by a solvent after a post-baking. The optimum laser direct writing condition is obtained experimentally by changing various process parameters such as laser power, writing speed and focal length. The propagation and coupling loss of a optical waveguide was measured as 1dB/cm and 0.6dB/cm, respectively. Also, the minimum width of waveguide of $100{\mu}m$(ZPLW-207) is obtained. Finally, the waveguides of line, bend and branch type are successfully fabricated.

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Clinical applcation of water laser (Er,Cr:YSGG) (물방울 레이저의 다양한 임상 적용)

  • Park, Jung-Hyun
    • The Journal of the Korean dental association
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    • v.56 no.7
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    • pp.385-390
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    • 2018
  • Laser means "Light amplification by stimulated emission of radiation". Laser have unique characteristics according to wavelength. Wavelenth of Waterlase is 2780nm and it can be absorbed to water and hydroxyapatite. When laser is applied to some material, its temperature goes up due to laser's energy. But in dental treatment high temperature is not good for teeth. High temperature can make dental pulp and bone necrosis. Waterlase can be absorbed to water droplet, so when it burst, it can cut soft and hard tissue without raising temperature. so it is so proper to dental treatment.

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