• Title/Summary/Keyword: ND:YAG 레이저

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An analysis of Cutting Characteristic of Multilayer FPCB using Nd:YAG UV Laser System (Nd:YAG UV 레이저를 이용한 연성회로 다층기판 절단특성에 대한 연구)

  • Choi, Kyung-Jin;Lee, Young-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.3
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    • pp.9-17
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    • 2010

  • The FPCB is used for electronic products such as LCD display. The process of manufacturing FPCB includes a cutting process, in which each single FPCB is cut and separated from the panel where a series of FPCBs are arrayed. The most-widely used cutting method is the mechanical punching, which has the problem of creating burrs and cracks. In this paper, the cutting characteristics of the FPCB have been experimented using Nd:YAG DPSS UV laser as a way of solving this problem. To maximize the industrial application of this laser cutting process, test samples of the multilayered FPCB have been chosen as it is actually needed in industry. The cutting area of the FPCB has four different types of layer structure. First, to cut the test sample, the threshold laser cut-off fluence has been found. Various combinations of laser and process parameters have been made to supply the acquired laser cut-off fluence. The cutting characteristics in terms of the variation of the parameters are analyzed. The laser and process parameters are optimized, in order to maximize the cutting speed and to reach the best quality of the cutting area. The laser system for the process automation has been also developed.

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Operation characteristics of a diode side-pumped, high power Nd:YAG laser (다이오드 측면여기 고출력 Nd:YAG 레이저의 발진특성)

  • 문희종;이성만;김현수;고도경;차병헌;이종훈
    • Korean Journal of Optics and Photonics
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    • v.11 no.6
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    • pp.434-440
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    • 2000

  • We fabricated a high power Nd:YAG laser pumped by a 1 kW diode laser with a Lambertian-type diffusive reflector. Maximum cw power of 500 W with a slope efficiency of 49%, which corresponds to an optical efficiency of 46.7%, was obtained from a short linear resonator when a 5 mm rod was used. The efficiencies decreased when a 6 mm rod was used, due to the poor quality of the absorption distribution in the rod. The measured beam quality factor of 70, which is slightly smaller than the value calculated from the measured thermal focal lengths, shows that the absorption distribution in the rod is fairly uniform. iform.

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