• Title/Summary/Keyword: 펨토초 기술

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The study of optimal reduced-graphene oxide line patterning by using femtosecond laser pulse (펨토초 레이저 펄스를 이용한 환원된 그래핀의 최소 선폭 패턴 구현에 관한 연구)

  • Jeong, Tae-In;Kim, Seung-Chul
    • Journal of the Korea Convergence Society
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    • v.11 no.7
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    • pp.157-162
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    • 2020

  • In recent years, laser induced graphene process have been intensively studied for eco-friendly electronic device such as flexible electronics or thin film based energy storage devices because of its simple and effective process. In order to increase the performance and efficiency of an electronic device using such a graphene patterned structure, it is essential to study an optimized laser patterning condition as small as possible linewidth while maintaining the graphene-specific 2-dimensional characteristics. In this study, we analyzed to find the optimal line pattern by using a Ti:sapphire femtosecond laser based photo-thermal reduction process. we tuned intensity and scanning speed of laser spot for generating effective graphene characteristic and minimum thermal effect. As a result, we demonstrated the reduced graphene pattern of 30㎛ in linewidth by using a focused laser beam of 18㎛ in diameter.

  • https://doi.org/10.15207/JKCS.2020.11.7.157 인용 PDF KSCI

Direct writing of multi-layer diffraction grating inside fused silica glass by using a femtosecond laser (펨토초 레이저를 이용한 실리카 내부의 다층 회절격자 가공 기술)

  • Choi, Hun-Kook;Kim, Jin-Tae;Sohn, Ik-Bu;Noh, Young-Chul
    • Laser Solutions
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    • v.14 no.3
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    • pp.17-20
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    • 2011

  • 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 nm, a pulse width of 250 fs, a repetition rate of 100 kHz, and an average output power of 6 W was used. Two layer diffraction grating with a grating period of $6{\mu}m$ was successfully fabricated with the layer gap of 0.5, 1, 2, 3, and $5{\mu}m$, 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 $3{\mu}m$ by adjusting the gap of each layer with a grating period of $6{\mu}m$. Femtosecond laser direct writing technology of multi-layer has a potential to fabricate the diffraction grating with a grating period of below $1.5{\mu}m$.

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Temporal Characterization of Femtosecond Laser Pulses using Spectral Phase Interferometry for Direct Electric-field Reconstruction (주파수 위상 간섭계를 이용한 펨토초 레이저 펄스의 시간적 특성 연구)

  • 강용훈;홍경한;남창희
    • Proceedings of the Optical Society of Korea Conference
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    • 2001.02a
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    • pp.240-241
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    • 2001

  • 주파수 위상 간섭계를 이용한 전기장 재구성 방법(SPIDER)은 현재의 전자장치로 분해 해낼 수 없는 짧은 펄스의 시간적 특성을 광학적 방법을 사용하여 분해 해내는 기술이며, 다음과 같은 순서로 시간 영역의 펄스를 재구성한다 ： 1)주파수 간섭계(spectral inteferometry)를 사용하여 일정한 시간지연을 갖는 동일한 펄스 쌍을 만든다. 2)분산이 큰 물질(highly dispersive material)이나 에돌이 발 쌍(pairs of gratings)을 사용하여 크게 chirping되며 200배 전후로 펄스폭을 늘인 펄스를 생성한다. (중략)

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