Energy deposition and shock wave propagation during pulsed laser ablation in fused silica cavities
Energy deposition and shock wave propagation during pulsed laser ablation in fused silica cavities
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DOI：
10.1088/0022-3727/37/7/029
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发表时间：
2004-03
期刊：
影响因子：
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通讯作者：
X. Zeng;X. Mao;Sy-Bor Wen;R. Greif;R. Russo
中科院分区：
文献类型：
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作者：
X. Zeng;X. Mao;Sy-Bor Wen;R. Greif;R. Russo
利用激光阴影成像技术测量了脉冲激光烧蚀过程中产生的冲击波在空腔中的传播，并与平面上的激光烧蚀进行了比较。在熔融石英中制造具有相同直径和可变深度的腔，以提供3和6的纵横比（深度/直径）。结果发现，在空腔外部，在~30 ns之后，膨胀冲击波的半径与t2/5成比例，对应于由Sedov-Taylor解预测的球形爆炸波。计算得到的空腔外冲击空气的压力和温度均高于平面上的压力和温度。在空腔外驱动冲击波的入射能量小于在平面上驱动冲击波的入射能量;空腔长宽比越大，支撑冲击波的能量越小。等离子体壁相互作用进行了讨论，以解释驱动冲击波的能量急剧下降的空腔外。
Propagation of the shock wave generated during pulsed laser ablation in cavities was measured using laser shadowgraph imaging and compared with laser ablation on a flat surface. The cavities were fabricated in fused silica with the same diameter and variable depths to provide aspect ratios (depth/diameter) of 3 and 6. It was found that outside the cavity, after ~30 ns the radius of the expanding shock wave was proportional to t2/5, corresponding to a spherical blast wave as predicted by the Sedov–Taylor solution. The calculated pressures and temperatures of the shocked air outside of the cavities were higher than on the flat surface. The incident energy driving the shock wave outside the cavity was smaller than that on the flat surface; the greater the cavity aspect ratio, the smaller the energy supporting the shock wave. Plasma–wall interactions are discussed to explain the sharp decrease of the energy driving the shock wave outside the cavity.