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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 ㎛.