• Title/Summary/Keyword: Picosecond Laser

Search Result 75, Processing Time 0.031 seconds

10㎛-wide Pattern Engraving using Metal Specimens coated with a heterogeneous metal for Printed Electronics (이종 금속이 코팅된 금속소재를 이용한 인쇄전자소자용 선폭 10㎛급 패턴 가공)

  • Sohn, Hyonkee;Cao, Binh Xuan;Cho, Yong-Kwon;Shin, Dong-Sig;Choi, Jiyeon
    • Laser Solutions
    • /
    • v.17 no.4
    • /
    • pp.20-23
    • /
    • 2014

  • In printed electronics, printing rolls are used to transfer electronic ink onto a flexible substrate. Generally printing rolls are patterned in microscale by the indirect laser method. Since based on the wet etch process, the indirect method is neither environment-friendly nor suitable for making a printing roll with patterns narrower than $20{\mu}m$. In this paper, we have directly engraved micro-patterns into a Zn-coated metal specimens using a picosecond laser in order both to engrave $10{\mu}m$-wide patterns and to improve the pattern profile. Experiments showed that it is possible to engrave $10{\mu}m$-wide patterns with an a rectangular-shaped profile which is necessary for the dimensionally accurate printing.

  • PDF

Four-beam Interference Optical System for Laser Micro- structuring Using Picosecond Laser

  • Noh, Ji-Whan;Lee, Jae-Hoon;Shin, Dong-Sig;Sohn, Hyon-Kee;Suh, Jeong;Oh, Jeong-Seok
    • Journal of the Optical Society of Korea
    • /
    • v.13 no.1
    • /
    • pp.75-79
    • /
    • 2009

  • A four beam interference optical system for laser micro structuring using a pulse laser was demonstrated. The four beam interference optical system using a pulse laser(picosecond laser) can fabricate micro structure on mold material(NAK80) directly. Micro structure on the polymer can be reproduced economically by injection molding of the micro structure on the mold material. The four beam interference optical system was composed by the DOE(Diffractive Optical Element) and two lenses. The laser intensity distribution of four beam interference was explained by an interference optics point of view and by the image optics point of view. We revealed that both views showed the same result. The laser power distribution of a $1{\mu}m$ peak pattern was made by the four beam interference optical system and measured by the objective lens and CCD. A $1{\mu}m$ pitch dot pattern on the mold material was fabricated and measured by SEM(Scanning Electron Microscopy).

  • https://doi.org/10.3807/JOSK.2009.13.1.075 인용 PDF KSCI

Laser Ablation of Polypropylene Films using Nanosecond, Picosecond, and Femtosecond Laser

  • Sohn, Ik-Bu;Noh, Young-Chul;Kim, Young-Seop;Ko, Do-Kyeong;Lee, Jong-Min;Choi, Young-Jin
    • Journal of the Optical Society of Korea
    • /
    • v.12 no.1
    • /
    • pp.38-41
    • /
    • 2008

  • 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.

  • https://doi.org/10.3807/JOSK.2008.12.1.038 인용 PDF KSCI