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최훈국,유동윤,손익부,노영철,김영식,김수용,김완춘,김진봉,Choi, Hun-Kook,Yoo, Dongyoon,Sohn, Ik-Bu,Noh, Young-Chul,Kim, Young-Sic,Kim, Su-yong,Kim, Wan-Chun,Kim, Jin-Bong 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.1
In this paper, micro trench structure is fabricated by femtosecond laser for inserting optical reflecting wavelength filter in planar waveguide. The width and depth of the trench is controlled by femtosecond laser machining condition. Also, large scale of single channel with 500um and 1000um on silica plate is fabricated by femtosecond laser, and roughness of the channel surface is polished by $CO_2$ laser for the insertion of the filter. Then, the characteristic of the planar waveguide inserted the filter is verified.
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.
펨토초 레이저를 이용한 실리카 내부의 다층 회절격자 가공 기술
최훈국(Hun-Kook Choi),김진태(Jin-Tae Kim),손익부(Ik-Bu Sohn),노영철(Young-Chul Noh) 한국레이저가공학회 2011 한국레이저가공학회지 Vol.14 No.3
We fabricated a multi-layer diffraction grating inside fused silica glass by using a femtosecond laser direct writing method. The femtosecond laser with a wavelength of 515 ㎚, a pulse width of 250 fs, a repetition rate of 100 ㎑, and an average output power of 6 W was used. Two layer diffraction grating with a grating period of 6 ㎛ was successfully fabricated with the layer gap of 0.5, 1, 2, 3, and 5 ㎛, respectively. Also, we investigated the diffraction pattern by illuminating a He-Ne laser beam. Finally, we demonstrated the diffraction grating with a grating period of 3 ㎛ by adjusting the gap of each layer with a grating period of 6 ㎛. Femtosecond laser direct writing technology of multi-layer has a potential to fabricate the diffraction grating with a grating period of below 1.5 ㎛.
최훈국(Hun-Kook Choi),손익부(Ik-Bu Sohn),노영철(Young-Chul Noh),김진태(Jin-Tae Kim) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.2
We fabricated the diffraction grating on the surface of fused silica glass using a femtosecond laser. The grooves of diffraction grating has a lot of micro crack and debris result in reduced diffraction efficiency. So, we polished the diffraction grating with CO₂laser beam. With different scan number of CO₂laser beam, we observed the image of diffraction grating and measured the diffraction efficiency.
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.
유동윤,최훈국,손익부,노영철,신중원,Yoo, Dongyoon,Choi, Hun-Kook,Sohn, Ik-Bu,Noh, Young-Chul,Shin, Jung-Won 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.1
In this paper, controlling shape of optical fiber tip for endoscope was investigated for eliminating blind spot. The blind spot of endoscope is generated by divergence angle of optical fiber, so it is easy to generate blind spot when tightly focusing. In order to eliminate this region, fiber tip is necessary to be controlled as convex or concave. Illumination simulation of convex and concave type of fiber tip in the endoscope was in progress, so the distance of non- blind region was investigated in each case. As well as the simulation, the tip was fabricated as concave shape by UV laser machining. Then the beam radiation was measured to observe the blind region. The result showed that controlling the fiber tip as convex or concave shape makes the narrow blind region of illumination in endoscope.
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.
레이저 멀티 펄스 중첩과 회절광학소자를 이용한 숨쉬는 필름 고속 가공 기술
유동윤,최훈국,손익부,노영철,이용탁,김영재,김영한,강호민,노지환,Yoo, Dongyoon,Choi, Hun-Kook,Sohn, Ik-Bu,Noh, Young-Chul,Lee, Yong-Tak,Kim, Young-Jae,Kim, Young-Han,Kang, Ho-Min,Noh, Jihwan 한국레이저가공학회 2014 한국레이저가공학회지 Vol.17 No.3
In this paper, we studied a machining method using a diffractive beam splitter (DBS) and multi- pulse repeated radiation for breathable film. We fabricated micro-grooves on polypropylene (PP) films using multi-pulse radiation and one-shot radiation (radiating pulses at once) and a DBS. In the result, width and depth of the PP film using multi-pulse repeated radiation were more precisely controllable. Therefore, this method can be applicable to in manufacturing breathable film precisely at a high speed.
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.