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Laser-induced damage of nodular defects in dielectric multilayer coatings

机译：激光诱导介电多层涂层中结节缺陷的破坏

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摘要

Laser-induced damage (LID) of optical coatings has been extensively studied since the invention of the laser. It has been found that the defects, which are unavoidable in real-world optical coatings, are the main reason for triggering laser damage of optical components at low fluences. In particular, embedded nodules in dielectric multilayer coatings are the main limiting defects found in reflective optics operating in nanosecond regimes. During laser irradiation, thermomechanical damage occurs preferentially at nodules because of enhanced energy absorption due to electric-field intensity (EFI) enhancement and the degradation of mechanical stability due to discontinuous boundaries. This report reviews the recent studies of the LID due to nodular defects in dielectric multilayer coatings. First, we present statistical studies on the geometric model and laser damage mechanism of nodules in the real world and introduce the solutions to control the formation of nodules. However, the low density and diverse properties of real nodular defects make the systematic study of LID initiating from localized defects a time-consuming and challenging task. In this regard, experimental and theoretical studies of localized defect-driven LID using artificial defects with properties that can be controlled are highlighted. We also present recent research progress on the damage mechanism of artificial nodules interpreted from aspects of mechanical properties and electric-field enhancement. In addition, approaches for modifying the deposition process or multilayer design are examined to reduce the EFI enhancement in the nodules and to improve the laser damage resistance of near-infrared high-reflective coatings based on the deeper understanding of the underlying physics of the damage process.
机译：自从激光器发明以来，已经广泛研究了光学涂层的激光诱导损伤（LID）。已经发现，在现实世界的光学涂层中不可避免的缺陷是在低通量下触发光学组件的激光损伤的主要原因。特别是，在多层介质中嵌入的结核是在纳秒级工作的反射光学系统中发现的主要限制缺陷。在激光辐照期间，由于电场强度（EFI）增强导致能量吸收增强以及边界不连续而导致机械稳定性下降，因此热机械损伤优先发生在结节处。该报告回顾了由于介电多层涂层中存在结节缺陷而导致的LID的最新研究。首先，我们对现实中结核的几何模型和激光损伤机理进行统计研究，并介绍控制结核形成的解决方案。然而，真正的结节状缺陷的低密度和多种性质使得从局部缺陷开始的LID的系统研究成为一项耗时且具有挑战性的任务。在这方面，突出了使用具有可控制特性的人工缺陷对局部缺陷驱动的LID进行实验和理论研究。我们还从机械性能和电场增强方面解释了人造结节损伤机理的最新研究进展。此外，在对损伤过程的基本物理原理有更深入的了解的基础上，研究了修改沉积过程或多层设计的方法，以减少结节中的EFI增强并提高近红外高反射涂层的抗激光损伤性。 。

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  • 来源
    《Optical engineering》 |2018年第12期|121909.1-121909.19|共19页
  • 作者

    Jinlong Zhang; Hongfei Jiao; Bin Ma; Zhanshan Wang; Xinbin Cheng;

  • 作者单位

    Ministry of Education, Key Laboratory of Advanced Microstructure Materials, Shanghai, China,Tongji University, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Shanghai, China,Shanghai Jiao Tong University, IFSA Collaborative Innovation Center, Shanghai, China;

    Ministry of Education, Key Laboratory of Advanced Microstructure Materials, Shanghai, China,Tongji University, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Shanghai, China;

    Ministry of Education, Key Laboratory of Advanced Microstructure Materials, Shanghai, China,Tongji University, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Shanghai, China;

    Ministry of Education, Key Laboratory of Advanced Microstructure Materials, Shanghai, China,Tongji University, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Shanghai, China,Shanghai Jiao Tong University, IFSA Collaborative Innovation Center, Shanghai, China;

    Ministry of Education, Key Laboratory of Advanced Microstructure Materials, Shanghai, China,Tongji University, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Shanghai, China,Shanghai Jiao Tong University, IFSA Collaborative Innovation Center, Shanghai, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    optical coatings; nanosecond-pulse-laser damage; nodular defects;

    机译：光学涂料;纳秒脉冲激光损伤;结节性缺损;

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