• Title/Summary/Keyword: femtosecond pulse

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Ablation characteristics of femtosecond laser pulse-induced pressure waves in biological tissue (펨토초 펄스로 인한 조직 제거시 생성된 압력파의 특성 연구)

  • ;A. Komashko;M. Feit;A. Rubenchik
    • Proceedings of the Optical Society of Korea Conference
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    • 2002.07a
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    • pp.244-245
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    • 2002

  • 1 picosecond 보다 짧은 펄스길이를 갖는 초단파길이 레이저 펄스 (Ultrashort laser pulse, USLP)를 이용한 물질의 절제 (ablation)는 여타 nanosecond 영역의 레이저 절제와 많은 차이를 보인다(1). USLP는 순간 파워가 매우 높기 때문에 직접적으로 물질의 원자를 분리시켜 자유전자를 형성한다 이들 자유전자는 일반 선형흡수체 (linear absorbing chromophore)보다 흡수계수가 몇 십 배로 높아 대부분의 펄스 에너지가 표면 100-200 m 이내의 극히 작은 지역에 밀집되게 된다. (중략)

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Numerical Simulation of Soliton-like Pulse Formation in Diode-pumped Yb-doped Solid-state Lasers

  • Seong-Yeon, Lee;Byeong-Jun, Park;Seong-Hoon, Kwon;Ki-Ju, Yee
    • Current Optics and Photonics
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    • v.7 no.1
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    • pp.90-96
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    • 2023

  • We numerically solve the nonlinear Schrödinger equation for pulse propagation in a passively mode-locked Yb:KGW laser. The soliton-like pulse formation as a result of balanced negative group-delay dispersion (GDD) and nonlinear self-phase modulation is analyzed. The cavity design and optical parameters of a previously reported high-power Yb:KGW laser were adopted to compare the simulation results with experimental results. The pulse duration and energy obtained by varying the small-signal gain or GDD reproduce the overall tendency observed in the experiments, demonstrating the reliability and accuracy of the model simulation and the optical parameters.

  • https://doi.org/10.3807/COPP.2023.7.1.90 인용 PDF