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노지환,이제훈,서정,손현기,신동식 한국레이저가공학회 2007 한국레이저가공학회 학술대회 논문집 Vol.2007 No.-
The super-hydrophobic surface has been fabricated by various methods. For mass-production, it was needed to fabricate the super-hydrophobic pattern on mold surface. We fabricated the super-hydrophobic pattern on mold surface(NAK80) using laser ablation method. The super-hydrophobic pattern was transferred on PDMS. The contact angle experiment of patterned PDMS show super-hydrophobic characteristics (A contact angle is above 160°). By using the injection molding of super-hydrophobic pattern on mold, a cheap super-hydrophobic surface can be fabricated.
피코세컨드 레이저의 간섭현상을 이용한 마이크로 스트럭쳐 제작
노지환,이제훈,조일환,나석주 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A interference optical setup using beam splitter was made using CW laser(continuous laser) for exposing photo resist material. A four beam interference optical system for laser micro structuring using pulse laser was demonstrated inthis paper. The four beam interference optical system using pulse laser(picosecond laser) can fabricate micro structure on mold material(NAK80) directly. Micro structure on the polymer can be reproduced economically by injection molding of the micro structure on mold material. The four beam interference optical system was composed by the DOE(Diffractive Optical Element) and two lenses. Laser power distribution of peak pattern was made by the four beam interference optical system and measured by objective lens and CCD. pitch dot pattern on the mold material was fabricated and measured by SEM(Scanning electron microscopy).
Four beam interference 위한 레이저 광학계에 대한 연구
노지환,이제훈,서정,손현기 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
Optical setup for Four beam interference was demonstrated in this paper. Conventional interference optical setup is very difficult to keep same optical path especially four beam instead of two beam. Pulse laser was used for Four beam interference source. This make it possible to make direct pattern on the mold material. Conventional interference optical setup used the continuous wave laser instead of pulse laser because continuous laser has long coherent length.
Fabrication of a random convex-lens-shaped microstructure using a laser ablation
노지환,이재훈,나석주 한국물리학회 2012 Current Applied Physics Vol.12 No.5
A convex-lens-shaped microstructure with a diameter of 50 mm on a metallic mold substrate was fabricated in this paper. A laser ablation process, in which the laser beam was focused and irradiated on the metallic mold substrate in order to remove a part of the substrate, was used for that. The convexlens-shaped microstructure has not been reported in any studies of microstructure using the laser ablation process. It was proposed that the unbalanced ablation and re-adherence of the melted particles was the processing mechanism of the convex lens shape. The convex-lens-shaped microstructure fabricated in this study is smaller than the focused spot. It was expected that the same convex-lensshaped microstructure can be fabricated even if the focused spot size is increased, so long as the fluence of the laser can be maintained. Therefore, the method proposed in this paper will improve the low processing speed, which has been the problem of a laser ablation process. The fabricated convex-lensshaped microstructure on the metallic substrate can be used as the mold for the micro lens.
노지환,이제훈,서정,조일환 한국레이저가공학회 2008 한국레이저가공학회 학술대회 논문집 Vol.2008 No.-
A terpanning aptics is the optical system which makes focus laser beam rotate and incline to the material processing surface. The trepanning optics is used to improve the quality of laser drilling process and control the taper of drilling diameter. In this paper, wedge is used for trepanning optics. The wedge trepanning optics has advantage on the high speed of rotation. we developed the wedge trepanning optics module and perform the laser drilling with that trepanning optics.
노지환(Ji-whan Noh),이제훈(Jae-Hoon Lee),서정(Jung Suh),손현기(Hyon-kee Sohn),신동식(Dong-sig shin) 한국레이저가공학회 2007 한국레이저가공학회지 Vol.10 No.3
A trepanning optics is the optical system which makes focus laser beam rotate and incline to the material processing surface. The trepanning optics is used in order to improve the quality of laser drilling process and control the taper of drilling diameter. In order to make trepanning optics, we can use the eccentricity of lens, scanner using two mirror, dove prism, or wedge. Among these method, in this paper wedge is used for trepanning optics. The wedge trepanning optics has advantage on the high speed of rotation. In this paper, we design the wedge trepanning optics using ray tracing. ements and engine design variables of system to satisfy the customer"s requirements.