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首页> 外文期刊>Physical review >Role of phase instabilities in the early response of bulk fused silica during laser-induced breakdown
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Role of phase instabilities in the early response of bulk fused silica during laser-induced breakdown

机译：相不稳定性在大体积熔融石英激光诱导击穿早期响应中的作用

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摘要

We report on the experimental and hydrocode modeling investigation of the early material response to localized energy deposition via nanosecond laser pulses in bulk fused silica. A time-resolved microscope system was used to acquire transient images with adequate spatial and temporal resolution to resolve the material behavior from the onset of the process. These images revealed a high-pressure shock front propagating at twice the speed of sound at ambient conditions and bounding a region of modified material at delays up to one nanosecond. Hydrocode simulations matching the experimental conditions were also performed and indicated initial pressures of ~40 GPa and temperatures of ~1 eV at the absorption region. Both the simulations and the image data show a clear boundary between distinct material phases, a hot plasma and solid silica, with a suggestion that growth of perturbations at the Rayleigh-Taylor unstable interface between the two phases is the seed mechanism for the growth of cracks into the stressed solid.
机译：我们报告的实验和水动力模型研究的早期材料响应通过散装熔融二氧化硅中的纳秒激光脉冲的局部能量沉积。使用时间分辨显微镜系统获取具有足够空间和时间分辨率的瞬态图像，以从过程开始就解决材料行为。这些图像显示了一个高压冲击锋面，它在环境条件下以两倍的声速传播，并以一纳秒的延迟限制了改性材料的区域。还进行了与实验条件相匹配的水压模拟，并表明在吸收区域的初始压力约为40 GPa，温度约为1 eV。模拟和图像数据均显示了不同材料相，热等离子体和固体二氧化硅之间的清晰边界，这表明在两个相之间的Rayleigh-Taylor不稳定界面处的扰动增长是裂纹扩展的种子机制。进入压力固体。

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