• 제목/요약/키워드: laser application

검색결과 1,259건 처리시간 0.022초

Pulsed-laser-diode Intermittently Pumped 2-㎛ Acousto-optic Q-switched Tm:LuAG Laser

  • Wen, Ya;Jiang, Yan;Zheng, Hao;Zhang, Hongliang;Wang, Chao;Wu, Chunting;Jin, Guangyong
    • Current Optics and Photonics
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    • 제4권3호
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    • pp.238-246
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    • 2020
  • The heat distribution in crystals in a 2-㎛ acousto-optic Q-switched Tm:LuAG laser pumped by pulsed-laser-diode (pulsed-LD) intermittent-pumping technology was analyzed using COMSOL software. The thermal lensing effect of the Tm:LuAG crystal can be mitigated by pulsed-LD intermittent-pumping techniques. An experimental setup using this kind of approach achieved maximum output energy of 8.31 mJ, minimum pulse width of 101.9 ns, and highest peak power of 81.55 kW, reached at a Q-switched repetition rate of 200 Hz. It offers significant improvement of performance of the output laser beam, compared to pulsed-LD double-ended pumping technology at the same repetition rate.

Nanosecond Laser Cleaning of Aluminum Alloy Oxide Film

  • Hang Dong;Yahui Li;Shanman Lu;Wei Zhang;Guangyong Jin
    • Current Optics and Photonics
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    • 제7권6호
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    • pp.714-720
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    • 2023
  • Laser cleaning has the advantages of environmental protection, precision, and high efficiency, and has good prospects for application in removing oxide films on the surface of aluminum alloy. This paper discusses the cleaning threshold and cleaning mechanism of aluminum alloy surface oxide film. A nanosecond pulsed laser was used to remove a 5-㎛-thick oxide film from the surface of 7A04 aluminum alloy, and the target surface temperature and cleaning depth were simulated. The effects of different laser energy densities on the surface morphology of the aluminum alloy were analyzed, and the plasma motion process was recorded using a high-speed camera. The temperature measurement results of the experiment are close to the simulation results. The results show that the laser cleaning of aluminum alloy oxide film is mainly based on the vaporization mechanism and the shock wave generated by the explosion.

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

  • 강희신;서정;이제훈;김정오
    • 한국레이저가공학회지
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    • 제8권1호
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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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High Repetition Wavelength-locked 878.6 nm LD Dual-end-pumped Nd:YVO4 1064 nm Laser

  • Li, Yue;Yu, Yong-Ji;Wang, Yu-Heng;Liu, Hang;Liu, He-Yan;Jin, Guang-Yong
    • Current Optics and Photonics
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    • 제2권6호
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    • pp.582-588
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    • 2018
  • A $Nd:YVO_4$ laser dual-end-pumped by a wavelength-locked 878.6 nm laser diode is presented. At the repetition rate of 500 KHz, the absorbed pump power of 58 W, an output power of 26.1 W at 1064 nm is obtained, corresponding to an optical-optical efficiency of 45%. The pulse width is 44.2 ns. Meanwhile, the effects of traditional 808 nm pumping and 878.6 nm dual-end-pumping on the output laser beam quality and pulse width are compared and analyzed in an experiment.

일상적 치과진료에서 레이저의 사용 A to Z (LASER application A to Z in general dental practice)

  • 장성용
    • 대한치과의사협회지
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    • 제53권12호
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    • pp.917-925
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    • 2015
  • LASER application has many advantages in the field of dentistry, however, it is not easy to apply dental LASER in general practice. Various LASER systems are in the market and it is little bit confused which LASER systems are useful. Most of all, it is important to select the appropriate LASER system to their own usage. In the present article, I introduce several LASER system such as $CO_2$, Diode, Nd:YAG, Er:YG, Er,Cr:YSGG, and its application according to specific disease criteria.

이종 금속이 코팅된 금속소재를 이용한 인쇄전자소자용 선폭 10㎛급 패턴 가공 (10㎛-wide Pattern Engraving using Metal Specimens coated with a heterogeneous metal for Printed Electronics)

  • 손현기;카오 후안 빈;조용권;신동식;최지연
    • 한국레이저가공학회지
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    • 제17권4호
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    • pp.20-23
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    • 2014
  • In printed electronics, printing rolls are used to transfer electronic ink onto a flexible substrate. Generally printing rolls are patterned in microscale by the indirect laser method. Since based on the wet etch process, the indirect method is neither environment-friendly nor suitable for making a printing roll with patterns narrower than $20{\mu}m$. In this paper, we have directly engraved micro-patterns into a Zn-coated metal specimens using a picosecond laser in order both to engrave $10{\mu}m$-wide patterns and to improve the pattern profile. Experiments showed that it is possible to engrave $10{\mu}m$-wide patterns with an a rectangular-shaped profile which is necessary for the dimensionally accurate printing.

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Laser Welding Application in Car Body Manufacturing

  • Shin, H.O.;Chang, I.S.;Jung, C.H.
    • International Journal of Korean Welding Society
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    • 제3권1호
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    • pp.2-7
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    • 2003
  • Laser welding application for car body manufacturing has many advantages in the stiffness and the lightness of vehicle, the productivity of assembly line, and the degree of freedom in design. This presentation will express the innovation of car body manufacturing including parameter optimization, process modeling, and system integration. In this application the investment for systems was cut down dramatically by real time switching over the laser path between two welding stations. Points of technical discussion are as follows; optimization of parameters such as laser power, robot speed and trajectory, compact and useful design of jig & fixture to assure welding quality for 3 sheet-layer zinc-coated steel, system integration between 4㎾ Nd:YAG laser device and the other systems, on-line real time welding quality monitoring system, perfect safety standards for high power laser, minimization of consumption costs such as arc lamp, protective glass for optic, etc. This application was successfully launched mass production line in 2001. The laser-welded line of side panel consists of 122 stitches totally. And the length is about 2.4m.

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Development of Laser Process and System for Stencil Manufacturing

  • Lee, Jae-Hoon;Jeong Suh;Shin, Dong-Sig;Kim, Jeon-O;Lee, Young-Moon
    • International Journal of Precision Engineering and Manufacturing
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    • 제4권1호
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    • pp.23-29
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    • 2003
  • Stencil is used normally as a mask for solder pasting on pad of a printed circuit board (PCB). The objective of this study is to develop a stencil cutting system and determine the optimal conditions to make good-quality stencil by using a Nd:YAG laser. The effects of process parameters such as laser power, type of mask, gas pressure, cutting speed and pulse duration on the cut edge quality were investigated. In order to analyze the cut surface characteristics (roughness, kerfwidth, dross) optical microscopy, SEM microscopy and roughness measurements were used. As a result, the optimal conditions of cutting process parameters were determined, and the practical feasibility of the proposed system was also examined by using a commercial Gerber file for PCB stencil manufacturing.

515nm 피코초 레이저를 이용한 구리 어블레이션 공정의 최대 가공율에 대한 이론적 분석 (Theoretical analysis on the maximum volume ablation rate for copper ablation with a 515nm picosecond laser)

  • 신동식;조용권;손현기;서정
    • 한국레이저가공학회지
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    • 제16권2호
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    • pp.1-6
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    • 2013
  • Picosecond lasers are a very effective tool for micromachining metals, especially when high accuracy, high surface roughness and no heat affected zone are required. However, low productivity has been a limit to broadening the spectrum of their industrial applications. Recently it was reported that in the micromachining of copper with a 1064nm picosecond laser, there exist the optimal pulse energy and repetition rate to achieve the maximum volume ablation rate. In this paper, we used a 515nm picosecond laser, which is more efficient for micromachining copper in terms of laser energy absorption, to obtain its optimal pulse energy and repetition rate. Theoretical analysis based on the experimental data on copper ablation showed that using a 515nm picosecond laser instead of a 1064nm picosecond laser is more favorable in that the calculated threshold fluence is 75% lower and optical penetration depth is 50% deeper.

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The Three-wavelength PR3+:YLF Laser at 604 nm 607 nm and 640 nm with Fabry-Perot Etalon

  • Jin, Long;Jin, Yu-Shi;Dong, Yuan;Li, Qing-Song;Yu, Yong-Ji;Li, Shu-Tao;Jin, Guang-Yong
    • Current Optics and Photonics
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    • 제2권5호
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    • pp.448-452
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    • 2018
  • A three-wavelength $Pr^{3+}:YLF$ laser at 604 nm, 607 nm and 640 nm simultaneously output by Fabry-Perot (F-P) etalon has been obtained. A 444 nm blue laser diode is used for pumping the $Pr^{3+}:YLF$ crystal, and a 0.1 mm F-P etalon is inserted in the resonator to select wavelength. The theoretical model of three-wavelength $Pr^{3+}:YLF$ laser is established, by adjusting the tilt angle of the etalon, the transmittances of the different wavelengths can be controlled, and the threshold values can be made to equalize by controlling the loss among different wavelengths. In the experiment, when the tilt angle of etalon is $9^{\circ}$ and the optimized length of resonator is 48 mm, the total output power of 25 mW at the three-wavelength is achieved at incident pump power of 7.5 W.