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노지환(Jiwhan Noh),이제훈(Jae-Hoon. Lee),서정(Jung. Suh),손현기(Hyonkee. Sohn),신동식(Dongsig. Shin) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The hydrophobic surface has been fabricated by various methods. Plasma is the typical method of fabricating the hydrophobic surface. We fabricated the super-hydrophobic pattern on mold surface(NAK80) using ultra-short 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.
노지환(Jiwhan Noh),이제훈(Jae-Hoon Lee),서정(Jeong Suh),조일환(Il-Hwan Cho) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Diffraction grating is the optical device which has periodic pattern. Decorative logotypes is the one of application of diffraction grating. In this paper diffraction grating for decorative logotype is fabricated by dot pattern in stead of line pattern. A metallic mold for diffraction gratings is fabricated with a mode-locked 12 ps Nd:YVO4 laser. Laser pulses with a wavelength of 355㎚ are irradiated on the surface of NAK80, a mold material, to generate dot patterns. Inorder to minimize the dot diameter, laser power is set just above the ablation threshold of NAK80. Results show that the spectrum from the fabricated mold is good enough for some industrial application
노지환(Jiwhan Noh),이제훈(Jae-Hoon Lee),손현기(Hyonkee Sohn),서정(Jeong Suh),신동식(Dongsing Shin) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Picosecond(ps) laser micro-machining has emerged as an attractive method of fabricating high-precision microstructures, especially in metals. In this paper, a metallic mold for diffraction gratings is fabricated with a mode-locked 12 ps Nd YVO₄ laser Laser pulses with a wavelength of 355㎚ are irradiated on the surface of NOK 80, a mold material, to generate line patterns. In order to minimize the line width, laser power is set just above the ablation threshold of NOK 80. Results show that the spectrum from the fabricated mold is good enough for some industrial application
노지환(Jiwhan Noh),이제훈(Jae-Hoon Lee),손현기(Hyonkee Sohn),서정(Jeong Suh),신동식(Dongsig Shin),정용운(youngun Joung) 한국레이저가공학회 2006 한국레이저가공학회지 Vol.9 No.3
Diffraction grating is the optical device which has periodic pattern. Decorative logotypes is the one of application of diffraction grating. In this paper diffraction grating for decorative logotype is fabricated by dot pattern in stead of line pattern. A metallic mold for diffraction gratings is fabricated with a mode-locked 12 ps Nd:YVO4 laser. Laser pulses with a wavelength of 355㎚ are irradiated on the surface of NOK 80, a mold material, to generate dot patterns. In order to minimize the dot diameter, laser power is set just above the ablation threshold of NOK 80. Results show that the spectrum from the fabricated mold is good enough for some industrial application.
노지환(Jiwhan Noh),이제훈(Jae-Hoon Lee),손현기(Hyonkee Sohn),서정(Jeong Suh),신동식(Dongsig Shin) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Picosecond (ps) laser micro-machining has emerged as an attractive method of fabricating high-precision microstructures, especially in metals. In this paper, a metallic mold for diffraction gratings is fabricated with a mode-locked 12 ps Nd: YVO₄ laser. Laser pulses with a wavelength of 355㎚ are irradiated on the surface of NOK 80, a mold material, to generate line patterns. In order to minimize the line width, laser power is set just above the ablation threshold of NOK 80. Results show that the spectrum from the fabricated mold is good enough for some industrial application.