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Langmuir probe study of laser ablation plume dynamics

机译：Langmuir探针对激光消融羽流动力学的研究

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For many applications of pulsed laser ablation it is necessary to have an understanding of the expansion dynamics of the ablation plume both in vacuum and in low pressure gases. Knowledge of the ablation plume hydrodynamics can also contribute to the understanding of the laser ablation process. In this paper we will consider some of the existing theoretical models of laser ablation plume expansion and draw some conclusions as to which model is most appropriate for the low temperature plasmas which arise in pulsed laser deposition. For ablation plumes which are significantly ionised, Langmuir probes have proved to be a relatively simple and inexpensive tool for measuring the plume shape, ion energy distribution and electron temperature. We describe some recent work on the development of Langmuir probes for laser ablation plume diagnosis. Typically in laser ablation plasma the flow velocity is supersonic, which complicates the interpretation of the Ⅰ-Ⅴ probe characteristic. We describe some new work on the behaviour of a flat probe lying parallel to the plasma flow. For nanosecond ablation of silver, we also show how a planar Langmuir probe can be used to obtain a fairly comprehensive description of the expansion dynamics of the ionised part of the ablation plume, including plume shape, ion energy distribution and electron temperature.
机译：对于脉冲激光烧蚀的许多应用，必须了解在真空和低压气体中烧蚀羽流的膨胀动力学。对消融羽流流体动力学的了解也有助于理解激光消融过程。在本文中，我们将考虑一些现有的激光烧蚀羽流膨胀理论模型，并得出结论，即哪种模型最适合脉冲激光沉积中产生的低温等离子体。对于被显着电离的消融羽流，Langmuir探头已被证明是一种相对简单且便宜的工具，用于测量羽流形状，离子能量分布和电子温度。我们描述了用于激光消融羽流诊断的Langmuir探头开发的一些最新工作。通常在激光烧蚀等离子体中，流速是超音速的，这使得对Ⅰ-Ⅴ探针特性的解释变得复杂。我们描述了一些关于平行于等离子体流的扁平探针的行为的新工作。对于银的纳秒消融，我们还展示了如何使用平面Langmuir探针获得对消融羽流电离部分的膨胀动力学的相当全面的描述，包括羽流形状，离子能量分布和电子温度。

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