使用多光谱手段研究熔石英断裂机理

发布时间：2018-01-05 06:25

本文关键词：使用多光谱手段研究熔石英断裂机理　出处：《光谱学与光谱分析》2017年11期 　论文类型：期刊论文

【摘要】：熔石英玻璃是高能激光系统中不可缺少的光学材料,其损伤问题一直是限制系统能量提升的瓶颈之一。通过纳秒激光脉冲诱导熔石英玻璃样品产生断裂,并使用多光谱手段对断裂前后样品进行检测,从而在实验和理论上了解了样品断裂形貌及内部相变结构成因,并从宏观到微观上统一解释了断裂形貌和相变结构的关系。在激光等离子冲击波作用下,熔石英发生断裂,且冲击波作用过程中在玻璃内部产生了推动裂纹扩展的尖端环向应力。在尖端环向应力作用下,不同损伤区域形成了不同扩展速度和长度的裂纹,按照裂纹形貌特性差异可以将断裂区分为雾化区、羽毛区、镜面区三个部分。使用透射光谱、能量散射光谱检测损伤前后样品,发现裂纹的产生引起了玻璃透过率和带隙的下降,且断裂区出现氧原子游离或缺失;使用Raman光谱检测样品损伤前后不同形貌区,发现等离子冲击波使熔石英中Si—O—Si键断裂并发生重组,导致镜面区、羽毛区、雾化区三元拓扑环和四元拓扑环宏观上对应的斯石英相和柯石英相的相对含量依次升高,破坏了材料的固有原子结构特性,使材料断裂区向高密度相转变。氧游离的发生会在玻璃内部产生的大量缺陷,从而使得玻璃透过率及带隙下降,严重影响了玻璃的性能。
[Abstract]:Fused silica glass is an indispensable optical material in high energy laser system. The damage problem is one of the bottlenecks to limit the energy increase of the system. The nanosecond laser pulse induces the fracture of fused quartz glass sample. The multispectral method was used to detect the samples before and after fracture, so that the fracture morphology and the formation of internal phase transition structure of the samples were studied experimentally and theoretically. The relationship between fracture morphology and phase transition structure is explained uniformly from macroscopic to microcosmic. Under the action of laser plasma shock wave, the fused quartz is fractured. In the process of shock wave, the tip toroidal stress is produced in the glass to promote the crack propagation. Under the action of the tip toroidal stress, the crack with different propagation speed and length is formed in different damage areas. According to the difference of crack morphology, the fracture can be divided into three parts: atomization zone, feather area and mirror area. The samples before and after damage can be detected by transmission spectrum and energy scattering spectrum. It is found that the occurrence of cracks leads to the decrease of glass transmittance and band gap, and oxygen atom dissociation or absence in the fracture zone. Raman spectra were used to detect the different morphologies of the samples before and after the damage. It was found that plasma shock wave made the Si-O-Si bond break and recombine in fused quartz, which led to the mirror area and feather area. The relative contents of the quartz and coesite phases in the atomized region of the ternary topological ring and the quaternary topological ring increase in turn, thus destroying the intrinsic atomic structure of the material. A large number of defects will occur in the glass due to the occurrence of oxygen ionization, which leads to the decrease of the glass transmittance and band gap, which seriously affects the properties of the glass.
【作者单位】：四川大学电子信息学院;中国工程物理研究院激光聚变研究中心;
【基金】：国家自然科学基金项目(11574221)资助
【分类号】：TN249
【正文快照】： 引言高能激光技术在工业加工、激光武器等领域中的广泛应用,使激光诱导光学元器件损伤问题受到人们高度关注[1-2]。熔石英玻璃作为一种常见的高功率光学元件,研究其损伤机理,可为提高系统输出能量提供理论基础[3-4]。激光等离子冲击波作用熔石英玻璃时,国内外学者大致从宏观热

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