研究了激光诱导微粒的三维空间传播规律。实验结果表明:光斑面积为0.8 mm ²、激光分光比为25.4、能量平均值为8 mJ的单脉冲激光与融石英作用产生的微粒的直径为0.3~10.0 μm;这些微粒大多沿中性面喷出,散射角大,浓度呈上高下低的分布形式;微粒在水平面上的沉降占比沿纵向(入射光线反方向)和横向(垂直入射光线方向)单调递减,但在纵向120 mm和360 mm处出现了局部高峰。微粒的运动距离与其直径成反比,直径为0.3 μm的微粒的最远出射距离不大于622 mm。

The propagation law of laser-induced particles in three-dimensional space is studied. The interaction of single pulse laser with fused silica can produce particles with diameter form 0.3 μm to 10.0 μm when the spot area is 0.8 mm 2, laser splitting ratio is 25.4 and average energy is 8 mJ. Most of these particles are sprayed along the neutral surface with a large scattering angle, while their concentrations are lessened from top to bottom. The proportion of particle sediments located at substrate is monotonically decreasing along the longitudinal (reverse direction of incident light) and horizontal (vertical to direction of incident light) direction except for a local growth occurring at 120 mm and 360 mm in longitudinal direction. The distances of movement of particles are inversely proportional to their diameters, and the particles with diameter of 0.3 μm can achieve the distance no more than 622 mm.