用于控制和可视化高能laser脉冲对液体目标的冲击的设备
Apparatus to control and visualize the impact of a high-energy laser pulse on a liquid target
摘要：
我们提出了一个实验装置，以控制和可视化的液体目标的激光诱导汽化的响应。我们使用毫米大小的液滴作为目标，并提出了两种液体染料的解决方案，允许由7个数量级的下降的激光的吸收系数的变化。激发源是Q开关Nd：YAG激光器，其倍频波长发射具有高于局部汽化阈值的能量密度的纳秒脉冲。激光能量的吸收导致了大规模的液体运动的时间尺度是分开的几个数量级，我们时空解决的超高速和频闪高分辨率成像在两个正交的意见相结合。令人惊讶的是，大规模的液体运动在激光冲击完全控制的空间能量分布通过一个精确的光束整形技术。该装置展示了激光物质相互作用的精确和定量研究的潜力。
英文摘要：
We present an experimental apparatus to control and visualize the response of a liquid target to a laser-induced vaporization. We use a millimeter-sized drop as target and present two liquid-dye solutions that allow a variation of the absorption coefficient of the laser light in the drop by seven orders of magnitude. The excitation source is a Q-switched Nd:YAG laser at its frequency-doubled wavelength emitting nanosecond pulses with energy densities above the local vaporization threshold. The absorption of the laser energy leads to a large-scale liquid motion at timescales that are separated by several orders of magnitude, which we spatiotemporally resolve by a combination of ultra-high-speed and stroboscopic high-resolution imaging in two orthogonal views. Surprisingly, the large-scale liquid motion at upon laser impact is completely controlled by the spatial energy distribution obtained by a precise beam-shaping technique. The apparatus demonstrates the potential for accurate and quantitative studies of laser-matter interactions.
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