• High Power Laser Science and Engineering
  • Vol. 10, Issue 6, 06000e42 (2022)
Kun Shuai1、2, Xiaofeng Liu2, Yuanan Zhao2、*, Keqiang Qiu3, Dawei Li2, He Gong4, Jian Sun2, Li Zhou5, Youen Jiang5, Yaping Dai6, Jianda Shao2、7, and Zhilin Xia1
Author Affiliations
  • 1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China
  • 2Laboratory of Thin Film Optics, Shanghai Institute of Optics and Fine Mechanics, Shanghai, China
  • 3National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, China
  • 4School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
  • 5National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, CAS, Shanghai, China
  • 6Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, China
  • 7Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
  • show less
    DOI: 10.1017/hpl.2022.34 Cite this Article Set citation alerts
    Kun Shuai, Xiaofeng Liu, Yuanan Zhao, Keqiang Qiu, Dawei Li, He Gong, Jian Sun, Li Zhou, Youen Jiang, Yaping Dai, Jianda Shao, Zhilin Xia. Multilayer dielectric grating pillar-removal damage induced by a picosecond laser[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e42 Copy Citation Text show less

    Abstract

    Multilayer dielectric gratings typically remove multiple-grating pillars after picosecond laser irradiation; however, the dynamic formation process of the removal is still unclear. In this study, the damage morphologies of multilayer dielectric gratings induced by an 8.6-ps laser pulse were closely examined. The damage included the removal of a single grating pillar and consecutive adjacent grating pillars and did not involve the destruction of the internal high-reflection mirror structure. Comparative analysis of the two damage morphological characteristics indicated the removal of adjacent pillars was related to an impact process caused by the eruption of localized materials from the left-hand pillar, exerting impact pressure on its adjacent pillars and eventually resulting in multiple pillar removal. A finite-element strain model was used to calculate the stress distribution of the grating after impact. According to the electric field distribution, the eruptive pressure of the dielectric materials after ionization was also simulated. The results suggest that the eruptive pressure resulted in a stress concentration at the root of the adjacent pillar that was sufficient to cause damage, corresponding to the experimental removal of the adjacent pillar from the root. This study provides further understanding of the laser-induced damage behavior of grating pillars and some insights into reducing the undesirable damage process for practical applications.
    $$\begin{align}B=\frac{4\pi}{\lambda^2}{n}_2\frac{\xi}{\tau},\end{align}$$ ((1))

    View in Article

    $$\begin{align}{\nabla}^2E+{k}^2{\mu}_{\mathrm{r}}{\varepsilon}_{\mathrm{r}}E=0,\end{align}$$ ((2))

    View in Article

    $$\begin{align}{\varepsilon}_{\mathrm{r}}={\varepsilon}_{\mathrm{c}}-\left[{e}^2 {n}_{\mathrm{e}}/\left({m}_{\mathrm{e}} {\varepsilon}_{\mathrm{v}}\right)\right]/\left({\omega}^2+{\omega_{\mathrm{k}}}^{-2}\right),\end{align}$$ ((3))

    View in Article

    $$\begin{align}\gamma =\omega \sqrt{\left({m}_{\mathrm{e}} {E}_{\mathrm{g}}\right)}/\left(e E\right)\end{align}$$ ((4))

    View in Article

    $$\begin{align}{\omega}_{\mathrm{M}}=A f\left(\gamma \right) \varPhi {\left[2l-\left(2{E}_{\mathrm{g}}/\mathrm{\hslash} \omega \right)\right]}^{0.5},\end{align}$$ ((5))

    View in Article

    $$\begin{align}{n}_{\mathrm{e}}={n}_{\mathrm{e}0} \exp \left({\omega}_{\mathrm{A}} {t}_{\mathrm{p}}\right),\end{align}$$ ((6))

    View in Article

    $$\begin{align}{P}_0={E}_{\mathrm{k}}/V,\end{align}$$ ((7))

    View in Article

    $$\begin{align}{E}_{\mathrm{k}}=\frac{\alpha -1}{2\alpha -1}{E}_{\mathrm{T}},\end{align}$$ ((8))

    View in Article

    $$\begin{align}{P}_0=\frac{\alpha -1}{2\alpha -1}{P}_{\mathrm{T}},\end{align}$$ ((9))

    View in Article

    $$\begin{align}{C}_{\mathrm{e}}\frac{\partial {T}_{\mathrm{e}}}{\partial t}=\nabla \cdot \left({K}_{\mathrm{e}}\nabla {T}_{\mathrm{e}}\right)-G\left({T}_{\mathrm{e}}-{T}_{\mathrm{i}}\right)+Q,\end{align}$$ ((10))

    View in Article

    $$\begin{align}{C}_{\mathrm{i}}\frac{\partial {T}_{\mathrm{i}}}{\partial t}=\nabla \cdot \left({K}_{\mathrm{i}}\nabla {T}_{\mathrm{i}}\right)+G\left({T}_{\mathrm{e}}-{T}_{\mathrm{i}}\right),\end{align}$$ ((11))

    View in Article

    Kun Shuai, Xiaofeng Liu, Yuanan Zhao, Keqiang Qiu, Dawei Li, He Gong, Jian Sun, Li Zhou, Youen Jiang, Yaping Dai, Jianda Shao, Zhilin Xia. Multilayer dielectric grating pillar-removal damage induced by a picosecond laser[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e42
    Download Citation