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레이저를 이용한 전자렌지용 숨쉬는 필름 가공 기술 연구
손익부,최훈국,유동윤,노영철,김정년,강호민,Sohn, Ik-Bu,Choi, Hun-Kook,Yoo, Dong-Yoon,Noh, Young-Chul,Kim, Joung-Nyon,Kang, Ho-Min 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.2
In this paper, we fabricated breathable films on the use of microwave oven by using UV nanosecond laser micromachining, and the number of micro-grooves on the film is controlled for different oxygen transfer rate(OTR). As different number of micro-groove, the breath films of 100,000cc, 120,000cc, and 150,000cc can be fabricated. The breath film package of 120,000cc is used for the experiment of steaming a sweet potato. At the result, the sweet potato is well-cooked with enough moisture in the package not bursted.
손익부(Ik-Bu Sohn),최성철(Sung-Chul Choi),노영철(Young-Chul Noh),고도경(Do-Kyeong Ko),이종민(Jongmin Lee) 한국레이저가공학회 2006 한국레이저가공학회지 Vol.9 No.2
We report experimental results on the high-speed micromachining using a femtosecond laser (800 ㎚ 130 fs, 1㎑) and galvanometer scanner system (Raylase, Germany). Periodic hole drilling of silicon and glass with the scan speed of 1-20 ㎜/s is demonstrated. Finally, we demonstrate the utility of the femtosecond laser application to ITO patterning by using a high-speed femtosecond laser scanner system.
손익부(Ik Bu Sohn),이만섭(Man Seop Lee),우정식(Jung Sik Woo),이상만(Sang Man Lee),정정용(Jeong Yong Chung) 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.1
??We report experimental results on the periodic patterning using a Ti:sapphire femtosecond laser (800 ㎚, 100 fs, 1㎑). Periodic structures with reproducible basic patterns are produced both on the surface and inside transparent materials. Period patterning for the application to display panel is widely investigated. Also, the submicron dot and line patterns are fabricated inside fused silica glass, which is important for the formation of diffraction grating in integrated optical circuit. Finally, we demonstrate the utility of the femtosecond laser application to optical memory by fabricating the three-dimensional dot patterns.
손익부(Ik-Bu Sohn),김영섭(Youngseop Kim),노영철(Young-Chul Noh) 한국레이저가공학회 2010 한국레이저가공학회지 Vol.13 No.1
Indium tin oxide (ITO) provides high electrical conductivity and transparency in thc visible and near IR (infrared) wavelengths. Thus, it is widely used as a transparent electrode for the fabrication of liquid crystal displays (LCDs) and organic light emitting diode displays (OLEDs), photovoltaic devices, and other optical applications. Lasers have been used for removing coating on polymer substrate for flexible display and electronic industry. In selective removal of ITO layer, laser wavelength, pulse energy, scan speed, and the repetition rate of pulses determine conditions, which are efficient for removal of ITO coating without affecting properties of the polymer substrate. ITO coating removal with a laser is more environmentally friendly than other conventional etching methods. In this paper, patterning of ITO film from polymer substrates is described. The Yb:KGW femtosecond laser processing system with a pulse duration of 250fs, a wavelength of 1030nm and a repetition rate of 100kHz was used for removing no coating in air. We can remove the ITO coating using a scanner system with various pulse energies and scan speeds. We observed that the amount of debris is minimal through an optical and a confocal microscope, and femtosecond laser pulses with 1030nm wavelength are effective to remove ITO coating without the polymer substrate ablation.
정덕,손익부,노영철,김진혁,김창환,이호,Jung, Deok,Sohn, Ik-Bu,Noh, Young-Chul,Kim, Jin-Hyeok,Kim, Changhwan,Lee, Ho 한국광학회 2014 한국광학회지 Vol.25 No.4
본 논문에서는 직경 $125{\mu}m$의 싱글모드 광섬유에 입사된 빔을 다방향으로 방사하기 위하여 이론적으로 계산된 값을 광학설계 프로그램인 LightTools를 이용하여 광섬유 끝단에 원뿔형 구조물을 모델링 하고 입사된 모든 빔이 전반사 되어 측면으로 방사되는 광섬유 팁과, 전방과 측면으로 동시에 방사가 가능한 광섬유 팁에 대해 시뮬레이션을 하였다. 이러한 결과를 가지고 광섬유 끝단에 펨토초 레이저와 $CO_2$ 레이저를 이용하여 원뿔형 구조물을 제작하고 시뮬레이션 결과와 비교 분석하는 연구를 수행하였다. In this paper, using the value theoretically calculated to emit multidirectionally a beam coming into an optical fiber with diameter of $125{\mu}m$, we modeled and produced a cone-shaped structure at the distal end of the fiber. A numerical simulation was performed for an optical fiber tip in which all incident beams were totally reflected and emitted toward the side, as well as for an optical fiber tip from which the beams could be emitted forward and sideways simultaneously. We produced multidirectional-firing optical fiber tips based on the simulation result and model. Laser fabrication of the optical fiber was done by processing a cone-shaped structure at the distal end of an optical fiber with diameter of $125{\mu}m$ using a femtosecond pulsed laser and polishing the processed surface with a $CO_2$ laser. We also conducted an analysis to compare experimental and simulation results.
CO<sub>2</sub> 레이저를 이용한 초정밀 광섬유 연마 레이저 기술
최훈국,손익부,노영철,정덕,이만섭,이서영,이형종,Choi, Hun-Kook,Sohn, Ik-Bu,Noh, Young-Chul,Jung, Deok,Lee, Man-Seop,Lee, Seo-Young,Lee, Hyung-Jong 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.2
In this paper, we controlled the edge angle of fiber by using $CO_2$ laser. In order to control the angle, tilting angle of fiber on stage and the number of scan repetition are adjusted, and laser power is fixed at 30 W in the experiment. In the polishing result, the edge angle of fiber can be changed from $4^{\circ}$ to $8^{\circ}$, as changing the tilting angle and the number of scan repetition. This $CO_2$ laser polishing can fabricate ball lenses with various curvatures and a sharp probe as well as the edge angled fiber.
CO<sub>2</sub> 레이저를 이용한 음각 원뿔 구조 광섬유 팁 가공 최적화 연구
유동윤,최훈국,손익부,노영철,정덕,김영섭,이호,김창환,Yoo, Dongyoon,Choi, Hun-Kook,Sohn, Ik-Bu,Noh, Young-Chul,Jung, Deok,Kim, Young-Sup,Lee, Ho,Kim, Chang-Hwan 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.3
A helical fabricating method using $CO_2$ laser was utilized for producing cone-shaped structure on a silica substrate. Output power and the number of scanning radiation were modified in order to control the structure. The experiment shows that the depth and width of cone-shape were increased with higher output power of the laser and the number of scanning. We demonstrate fabrication of multidirectional side-firing optical fiber with diameter of 440 um using the $CO_2$ laser fabrication technique.
펨토초 레이저를 이용한 PLC 가변광감쇠기 특성 향상을 위한 열간섭 차단 트렌치 가공 기술
유동윤,최훈국,손익부,김영식,김수용,김완춘,김진봉,Yoo, Dongyoon,Choi, Hun-Kook,Sohn, Ik-Bu,Kim, Youngsic,Kim, Suyong,Kim, Wanchun,Kim, Jinbong 한국광학회 2016 한국광학회지 Vol.27 No.4
본 논문에서는 다채널 가변광감쇠기에서 발생하는 열간섭 효과를 차단하여 광효율을 높이기 위하여 펨토초 레이저를 이용하여 트렌치를 가공하였다. 채널간 열간섭으로 인한 광감쇠 제어효율 하락을 막기 위하여, 가변광감쇠기 채널 사이에 펨토초 레이저로 트렌치의 폭과 깊이를 다르게 하여 가공하였고, 적용된 각 칩을 모듈화하여 전류에 따른 광감쇠율 변화를 관찰하였다. 그 결과 광감쇠를 위해 가해진 열이 주변채널에 영향을 매우 작게 미치는 것을 확인하였고, 뿐만 아니라 작은 전류에 광감쇠율이 민감하게 변화하는 것을 확인할 수 있어 효율적인 소자로서 개발 가능함을 확인하였다. In this paper, a trench structure was fabricated by femtosecond-laser machining to eliminate thermal crosstalk in a multichannel variable optical attenuator (VOA), to prevent decreasing attenuation efficiency of the VOA. Trenches of a variety of widths and depths were fabricated on the VOA chips by femtosecond-laser processing. After the machining, attenuation according to current change was observed in each VOA chip module with trenches. As a result, we could observe high responsivity of attenuation and low power consumption, and that the heat of each channel barely influenced other channels.