http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Laser Ablation of Polypropylene Films using Nanosecond, Picosecond, and Femtosecond Laser
손익부,노영철,김영섭,고도경,이종민,최영진 한국광학회 2008 Current Optics and Photonics Vol.12 No.1
Precise micropatterning of polypropylene film, which is highly transparent in the wavelength range over 250 nm has been demonstrated by 355 nm nano/picosecond laser and 785 nm femtosecond laser. Increments of both the pulse energy and the shot number of pulses lead to cooccurrence of photochemical and thermal effects, demonstrated by the spatial expansion of rim on the surface of PP. The shapes of the laser-ablated polypropylene films were imaged by optical microscope and measured by a 3D optical measurement system. And, the ablation depth and width of polypropylene film ablated by femtosecond laser at various pulse energy and pulse number were characterized. Our results demonstrate that a femtosecond pulsed laser is an efficient tool for fabricating micropatterns of polypropylene films, where the micropatterns are specifically tailored in size, location and number easily controlled by laser processing conditions.
손익부,고명진,김영섭,노영철 한국레이저가공학회 2009 한국레이저가공학회지 Vol.12 No.1
Ripple formation of femtosecond laser in stainless steel is investigated using 184 fs pulses with a center wavelength of 785 nm. The effect of the laser polarization relative to the translation direction is observed. For drilling with a certain aspect ratio, reflections at the hole walls take place, leading to a non-uniform intensity distribution deep inside the formed hole. Finally, it is shown that a circular polarization during the drilling process significantly improves the quality of the produced holes.
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.